Thunderbird Changelog

What's new in Thunderbird 115.10.1

Apr 21, 2024
  • Changes:
  • Added Thunderbird Supernova branding to about:dialog
  • Fixes:
  • Message list was not updated when message was deleted from server outside of Thunderbird
  • Scrolling behaved unexpectedly when moving to next message unread message in another folder
  • Scrolling animation was unnecessarily used when switching or toggling the sort column in message list
  • Attempting to delete a message and then cancelling the action still marked the message as read
  • Unified Toolbar could not be customized under certain tabs
  • Selecting a folder with one or more subfolders and pressing enter did not expand folder
  • Tooltips did not appear when hovering over folders
  • Deleting large amounts of messages from Trash folder consumed excessive time and memory
  • Message Summary header buttons were not keyboard accessible
  • "New" button in Message Filters dialog was not keyboard accessible
  • Backing up secret keys from OpenPGP Key Manager dialog silently failed
  • Various visual and UX improvements
  • Security fixes

New in Thunderbird 115.10.0 (Apr 17, 2024)

  • Fixes:
  • Creating a tag in General Settings with a number as the tag name did not work
  • Quick Filter button selections did not persist after restart
  • Collapsing and expanding message list headers sometimes caused header to scroll out of view
  • Single message with no children inside a parent thread sometimes displayed incorrectly as a thread with a duplicate of itself as its child
  • "Get selected messages" menu items did not work
  • "Download and Sync Messages" dialog was too short when using Russian locale, obscuring OK button
  • After changing password on an IMAP account, the account could become locked due to too many failed login attempts
  • Retrieving multiline POP3 message from server failed if message chunk ended in newline instead of carriage return and newline
  • IMAP, POP3, and SMTP Exchange autoconfiguration did not support encryption configuration
  • Non-empty address book search bar interfered with displaying/editing contacts
  • Deleting attendees from "Invite Attendees" view removed attendees from view, but not from invite
  • Splitter arrow between task list and task description did not behave as expected
  • Performance improvements and code cleanup
  • Security fixes

New in Thunderbird 125.0 Beta 5 (Apr 9, 2024)

  • Fixes:
  • GPG smartcards did not work in Thunderbird for macOS
  • Status of IMAP message download progress was incorrect in some locales

New in Thunderbird 125.0 Beta 4 (Apr 6, 2024)

  • Fixes:
  • SMTP messages using GSSAPI authentication failed to send
  • Hardware key multi-factor authentication did not in Thunderbird Flatpak

New in Thunderbird 125.0 Beta 3 (Apr 2, 2024)

  • Fixes:
  • SMTP messages using GSSAPI authentication failed to send
  • Hardware key multi-factor authentication did not in Thunderbird Flatpak

New in Thunderbird 125.0 Beta 1 (Mar 26, 2024)

  • What’s New:
  • OpenPGP Key Manager can now create revocation statements for any secret key
  • "Archived-At" message header field is now displayed as a link, and Message Permalink option is now available in List-Id menu
  • Thunderbird now decodes messages nested in attachments even if "decodeSubMessages" preference is set to "true"
  • Threaded message views now include "New Message" count
  • Fixes:
  • Improved Cards View UI
  • IMAP, POP3, and SMTP Exchange autoconfiguration did not support autoconfiguration of encryption
  • Creating a tag in General Settings with a number as the tag name did not work
  • Password Manager did not remember the last selected item when changing sorting or showing/hiding passwords in unfiltered view
  • Entries removed from Password Manager left behind blank entries
  • Quick Filter button selections did not persist after restart
  • Messages moved to junk folder from message context menu were marked as read, regardless of whether "Mark messages determined to be junk as read" was checked/unchecked in settings
  • IMAP accounts with missing or incorrect OAuth credentials sometimes caused duplicate dialogs to appear, requesting a new OAuth token
  • Retrieving multiline POP3 message from server failed if message chunk ended in newline instead of carriage return and newline
  • Connection sometimes timed out when a large number of POP3 messages were left on server
  • Collapsing and expanding message list headers sometimes caused header to scroll out of view
  • Holding Shift key while selecting "Delete" from message context menu did not permanently delete message
  • Holding Shift and middle-clicking a message with "loadInBackground" preference set to "false" did not open new tab in background as expected
  • Single message with no children inside a parent thread sometimes displayed incorrectly as a thread with a duplicate of itself as its child
  • "Watch Thread" command was incorrectly available on multi-folder and search views
  • "Ignore Thread" did not work on multi-folder and search views
  • Tooltip did not appear when hovering over subject line of messages in Table View
  • Message compose window was not fully disabled while message was sending
  • Delivery Status Notification did not work when sending message using "Send Later"
  • Thunderbird did not remove temporary directory created from adding attachment to message via drag-and-drop
  • Creating a new key from the OpenPGP Key Manager erroneously displayed a "Go Back" button on the first page of the wizard
  • Thunderbird sometimes changed the subject of messages selected while simultaneously decrypting a large PGP-encrypted message
  • New posts retrieved from RSS feeds incorrectly played mail alert sound
  • Non-empty address book search bar interfered with displaying/editing contacts
  • Deleting attendees from "Invite Attendees" view removed attendees from view, but not from invite
  • "Close" button in Cookie Manager is now more discoverable on macOS
  • Date column of "Grouped By" message views now refreshes at midnight, preventing incorrect dates from being displayed
  • "Download and Sync Messages" dialog was too short when using Russian locale, obscuring OK button
  • Changing message view density did not behave as expected
  • Various visual improvements

New in Thunderbird 124.0 Beta 5 (Mar 12, 2024)

  • Fixes:
  • IMAP folders containing other folders could not be deleted due to Thunderbird using "unsubscribe" IMAP command
  • Draft messages were not replaced when saved to an IMAP server without UIDPLUS
  • Flatpak builds only had the en-US spell check dictionary available

New in Thunderbird 115.8.1 (Mar 5, 2024)

  • Fixes:
  • Settings: Updating tags failed if Automatic Updates were disabled
  • Size of collapsed folders in folder pane did not include size of subfolders
  • Reversing sort order of Grouped By views in quick search did not reverse
  • Removing threaded messages in a unified folder sometimes resulted in an incorrect number of levels in the thread
  • Thread collapsing did not behave correctly when copying thread messages in multi-folder view
  • S/MIME encryption failed to encrypt if unsupported certificate type was encountered
  • Decrypting a copy of an S/MIME encrypted, opaque-signed message created an unreadable message
  • Thunderbird sometimes changed the subject of messages selected while simultaneously decrypting a large PGP-encrypted message
  • "Quote message" menu item in compose window did not work when replying to message opened in separate tab
  • Toolbar customization window contents overflowed the window width
  • Security fixes

New in Thunderbird 124.0 Beta 4 (Mar 5, 2024)

  • Fixes:
  • S/MIME-only signed messages sometimes incorrectly displayed signature as invalid

New in Thunderbird 124.0 Beta 3 (Feb 29, 2024)

  • Fixes:
  • Visual improvements to "Reorder Attachments" popup

New in Thunderbird 124.0 Beta 2 (Feb 29, 2024)

  • Fixes:
  • Threaded view was slow to load
  • Multi-language spellcheck sometimes skipped languages

New in Thunderbird 124.0 Beta 1 (Feb 21, 2024)

  • Changes:
  • Cards UI styling of expand and collapse for threads
  • Spam and Junk message styling in Card UI adjusted to be less distracting
  • Fixes:
  • Using middle-mouse click on a message (open in background tab) did not work
  • Group-by-sort Unified folders were slow to open when expanded-all
  • References and Reply-To headers were not set if they were included in mail.compose.other.header
  • Header pane was not shown when pref mailnews.headers.showUserAgent was set
  • "Open message in conversation" and "Open message in containing folder" from a standalone window failed
  • "Get Messages" toolbar button was initially disabled after opening a message from a file in a new window
  • "Get selected messages" menu items did not work
  • Sender in multimesage view was right aligned when the text wrapped to multiple lines
  • "Quote message" menu item in compose window did not work when replying to message opened in separate tab
  • POP error messages from server were not displayed
  • After changing password on an IMAP account, the account could become locked due to too many failed login attempts
  • Settings: Checkbox to enable underlined links was missing
  • Settings: Updating tags failed if Automatic Updates were disabled
  • Selecting "Match all messages" in Filter Rules dialog did not disable all search criteria
  • Toolbar customization window contents overflowed the window width
  • New mail notifications in Windows 11 stole focua from current window
  • "Copy/Cut" context menus did not work in extension options pages
  • Performance improvements and code cleanup
  • Keyboard navigation within search toolbar did not work
  • Cards UI style fixes

New in Thunderbird 115.8.0 (Feb 21, 2024)

  • What’s New:
  • Added option to show packet dump when OpenPGP fails to decrypt
  • Fixes:
  • Thunderbird slowed down significantly when opening email files (.eml)
  • Inbox view intermittently reverted to default view after moving or deleting messages
  • Size of collapsed folders in folder pane did not include size of subfolders
  • Hovering over folder does not always expand subfolders
  • Switching to thread pane of a folder using keyboard navigation did not focus top message
  • Clicking "Sent unsent messages" in Outbox context menu while in offline mode did not prompt user to go online
  • Mail tab-specific Unified Toolbar buttons received focus incorrectly
  • Quick Filter settings did not persist when Quick Filter bar was turned off
  • Quick Filters were unusually slow
  • OpenPGP Key Manager filtering did not work
  • OpenPGP sometimes attempted to decrypt message with incorrect key
  • Autoconfig failed on servers that did not support OAuth2
  • Opening different attachments with the same name in different messages could cause attachment files to become conflated
  • Overflowed attachment list could not be scrolled
  • Passwords disappeared from password manager list after applying and clearing filters
  • Cookies in cookie manager list disappeared after applying and then clearing filters
  • Security fixes

New in Thunderbird 123.0 Beta 4 (Feb 8, 2024)

  • Fixes:
  • Thunderbird slowed down significantly when opening email files (.eml)
  • Passwords disappeared from password manager list after applying and clearing filters
  • Cookies in cookie manager list disappeared after applying and then clearing filters

New in Thunderbird 123.0 Beta 3 (Feb 6, 2024)

  • Fixes:
  • Thunderbird slowed down significantly when opening email files (.eml)
  • Passwords disappeared from password manager list after applying and clearing filters
  • Cookies in cookie manager list disappeared after applying and then clearing filters

New in Thunderbird 123.0 Beta 2 (Jan 30, 2024)

  • Fixes:
  • Remote content warning was shown multiple times for the same message

New in Thunderbird 123.0 Beta 1 (Jan 25, 2024)

  • What’s New:
  • Added support for OS-specific accent colors
  • Manual account configuration now implements form validation
  • Added option to show packet dump when OpenPGP fails to decrypt
  • UI density now affects multi-message view
  • Changes:
  • Added Show more/less buttons to notifications in Account Hub
  • Folder alerts now display full path of affected folder
  • IMAP "Too Many Connections" alerts now display IMAP server name
  • Disabled support for LibrePGP v5 AEAD/OCB decryption
  • Fixes:
  • OpenPGP Key Manager filtering did not work
  • OpenPGP sometimes attempted to decrypt message with incorrect key
  • Autoconfig failed on servers that did not support OAuth2
  • Network settings window was blank
  • Selected row in folder pane did not always remain visible when using keyboard navigation
  • Hovering over folder does not always expand subfolders
  • Yahoo! and AOL account message filters only filtered most recent message match
  • Quick Filter settings did not persist when Quick Filter bar was turned off
  • Mail tab-specific Unified Toolbar buttons received focus incorrectly
  • Clicking "Sent unsent messages" in Outbox context menu while in offline mode did not prompt user to go online
  • "Confirm Deletion" prompt was incorrectly shown when deleting messages with Grouped By header also selected
  • Thread collapsing did not behave correctly when copying thread messages in multi-folder view
  • Opened ignored messages in a message thread/subthread were not marked as read in IMAP folders
  • Opening different attachments with the same name in different messages could cause attachment files to become conflated
  • Address Book scrolling did not work when using keyboard navigation
  • When creating new calendar, password prompt showed "rememberPassword" instead of "Use Password Manager to remember this password."
  • Overflowed attachment list could not be scrolled
  • Thread styling appeared on Grouped by Sort messages
  • Various visual and UX improvements
  • Known Issues:
  • Blocked remote content alert is shown twice when opening emails that contain remote content

New in Thunderbird 115.7.0 (Jan 25, 2024)

  • What’s New:
  • Autocrypt Gossip key distribution added
  • Fixes:
  • When starting Thunderbird, unread message count did not appear on collapsed accounts
  • Blank window was sometimes displayed when starting Thunderbird
  • Thunderbird "--chrome" flag incorrectly opened extra messenger.xhtml
  • Add-ons did not start correctly when opening Thunderbird from other programs
  • Drag-and-drop installation of add-ons did not work if Add-ons Manager was opened from Unified Toolbar
  • Double-clicking empty space in message pane incorrectly opened the currently selected message
  • Canceling SMTP send before progress reached 100% did not stop message from sending
  • PDF attachments open in a separate tab did not always restore correctly after restarting Thunderbird
  • Some OpenPGP dialogs were too small for their contents
  • Account Manager did not work with hostnames entered as punycode
  • Downloading complete message from POP3 headers caused message tab/window to close when "Close message window/tab on move or delete" was enabled
  • Some ECC GPG keys could not be exported
  • Contacts deleted from mailing list view still visible in Details view
  • After selecting contacts in Address Book and starting a new search, the search results list did not update
  • Various UX and visual improvements

New in Thunderbird 122.0 Beta 4 (Jan 11, 2024)

  • Fixes:
  • Reversing sort order of Grouped By views in quick search did not reverse
  • Size of collapsed folders in folder pane did not include size of subfolders
  • Switching to thread pane of a folder using keyboard navigation did not focus top message
  • Removing threaded messages in a unified folder sometimes resulted in an incorrect number of levels in the thread
  • Inbox view intermittently reverted to default view after moving or deleting messages

New in Thunderbird 115.6.1 (Jan 9, 2024)

  • What’s New:
  • OAuth2 now supported for comcast.net
  • Fixes:
  • High CPU usage sometimes occurred with IMAP CONDSTORE (conditional STORE) enabled
  • Replying to a collapsed thread via keyboard shortcut (Ctrl+R/Cmd+R) opened a reply for every message in the thread
  • Enabling Grouped By view after reversing sort order of column header caused messages to be grouped incorrectly
  • Opening thread pane context menu via keyboard did not always scroll view to selection
  • New mail indicator for POP3 accounts did not indicate new messages ready to be downloaded
  • Messages could not be moved to folders using Message > Move To if text or a link in the message had been clicked on first
  • MIME part boundaries were not properly terminated

New in Thunderbird 122.0 Beta 3 (Jan 9, 2024)

  • Fixes:
  • Some OpenPGP dialogs were too small for their contents
  • Account Manager did not work with hostnames entered as punycode
  • Blank window was sometimes displayed when starting Thunderbird

New in Thunderbird 122.0 Beta 2 (Jan 4, 2024)

  • Fixes:
  • Newsgroups did not always prompt for password, preventing download of list of groups
  • New mail indicator for POP3 accounts did not indicate new messages ready to be downloaded
  • Messages could not be moved to folders using Message > Move To if text or a link in the message had been clicked on first

New in Thunderbird 122.0 Beta 1 (Dec 21, 2023)

  • Changes:
  • Removed "mail.openpgp.key_assistant.enable" preference
  • Activity Manager now shows account and full folder path when indexing
  • Fixes:
  • When starting Thunderbird, unread message count did not appear on collapsed accounts
  • Thunderbird "--chrome" flag incorrectly opened extra messenger.xhtml
  • Thunderbird "--migration" flag opened empty window
  • Some menu bar items did not work with all Thunderbird windows closed on macOS
  • Add-ons did not start correctly when opening Thunderbird from other programs
  • Thread tree did not update when live language switching
  • Double-clicking empty space in message pane incorrectly opened the currently selected message
  • Card View behavioral and visual improvements
  • Sort order was sometimes incorrect in Grouped By views
  • Enabling Grouped By view after reversing sort order of column header caused messages to be grouped incorrectly
  • Contacts deleted from mailing list view still visible in Details view
  • Adding duplicate mail addresses in "New/Edit mailing list" dialog, pressing OK, then removing one of the duplicate addresses causes both addresses to be removed
  • Canceling SMTP send before progress reached 100% did not stop message from sending
  • Various S/MIME improvements
  • PDF attachments open in a separate tab did not always restore correctly after restarting Thunderbird
  • Drag-and-drop installation of add-ons did not work if Add-ons Manager was opened from Unified Toolbar
  • Opening thread pane context menu via keyboard did not always scroll view to selection
  • After selecting contacts in Address Book and starting a new search, the search results list did not update
  • Message List display options were hidden outside of Thunderbird window
  • Chat Account Settings did not allow scrolling to view overflowed window contents
  • Various visual improvements

New in Thunderbird 115.6.0 (Dec 20, 2023)

  • Fixes:
  • Message selection misbehaved after selecting a sub-message in an expanded thread, collapsing the thread, then pressing up/down to move selection
  • Thunderbird now attempts to reconnect on a new connection after SMTP 4xx errors
  • HTML FileLink attachments used the wrong encoding
  • Security fixes

New in Thunderbird 115.5.2 (Dec 12, 2023)

  • Fixes:
  • "Compact" option was missing from folder context menu for IMAP accounts using maildir
  • Message list could not be properly read by screen readers in table view
  • Messages with slow-loading images were delayed being marked as read
  • Messages opened in background tab were incorrectly marked as read
  • Mark All Read did not work for virtual folders
  • Delete (trash icon) in message display did not work in Unified folders
  • Unified folders were missing "Mark Folder Read" option in context menu
  • "Reply to List" was incorrectly disabled in Unified Toolbar since Thunderbird 115.4.1
  • Sorting by column with "Grouped By" enabled then performing a quick filter search caused blank message pane
  • Attachment list did not always appear if remote message content loaded slowly
  • Messages in outbox were not shown as unread by default
  • "Apply columns to" sometimes failed to apply columns to a root folder and its descendants
  • Global search results displayed as a list did not allow threads to be collapsed
  • "Quick Filter" button on toolbar was disabled when viewing search results as a list
  • Folder open hover delay was too short when using drag-and-drop
  • Parent folders with collapsed subfolders did not consistently display new mail indicator or message count for subfolders
  • Message list scroll position could move randomly when switching folders
  • Undoing deletion of local messages required using "Undo" (Ctrl-Z) twice
  • IMAP messages deleted in Thunderbird still appeared in other email clients that don't respect messages marked "deleted"
  • IMAP folder discovery was slowed by status bar message updates
  • Servers with non-LDH (letters-digits-hyphens) hostnames, such as those containing non-ASCII Unicode characters, could not be found
  • Images could not be copied and pasted from one message into another
  • Troubleshooting page (about:support) did not work on profiles with no outgoing email server, such as news-only profiles
  • Minimize/maximize button order was incorrect when placing window titlebar buttons on left-hand side
  • OpenPGP integraton with smartcard using latest version of Gpg4Win failed
  • Various accessibility improvements
  • Various UX and visual improvements

New in Thunderbird 115.5.1 (Dec 2, 2023)

  • Fixes:
  • Advanced GnuPG keys may be protected with an unexpected passphrase
  • OpenPGP signatures rejected due to mismatched signature timestamp now display signature timestamp and clarifying message
  • Advanced address book search did not return results if display name was left blank
  • Clicking on attendee when inviting attendees added the attendee twice

New in Thunderbird 115.5.0 (Nov 22, 2023)

  • Fixes:
  • Initial message was not automatically selected when opened in conversation
  • Newsgroup users using FQDN identity generated message ID headers with incorrect domain name
  • Link previews had poor legibility in dark mode
  • Plasma's task switcher displayed the default icon when running the Thunderbird Flatpak on Wayland
  • Link to Flatpak manifest was incorrect
  • Security fixes

New in Thunderbird 115.4.2 (Nov 8, 2023)

  • Fixes:
  • No messages or calendar items were displayed on startup
  • Toolbar & Folder View widget fixes
  • Insert image dialog was not properly sized on some localized builds
  • The "unencrypted subject" icon was always briefly displayed when replying to a message
  • RSS feeds with lengthy attachment filenames cut off visible content
  • RSS feeds with no favicon displayed default icon in the folder color
  • NNTP messages that were previously downloaded were not displayed if the server went offline
  • Vcard photos were not imported when using opening the file with Thunderbird
  • Publishing calendars to invalid URLs did not display a helpful error
  • Publishing calendar events via authenticated WebDAV failed
  • Converting a message to an event failed when the message pane was not displayed
  • Redirect dialog displayed for WebDAV calendars was too small
  • Visual and Theme improvements

New in Thunderbird 115.4.1 (Oct 26, 2023)

  • What’s New:
  • "Manage Newsgroups Subscription" now displayed on Account Central when using newsgroups
  • Fixes:
  • Manually configured authentication methods on accounts did no always persist
  • "Send Autocrypt key in header" preference was available on accounts with no encryption key
  • SHA-1 certificates were not accepted in Thunderbird 115; acceptance of SHA-1 messages can now be enabled via optional preference
  • Various Flatpak enhancements
  • Opening folder in new tab by clicking scroll wheel/middle mouse button did not work in Folder Pane
  • Message list did not automatically scroll to new messages when switching folders
  • "Move/Copy to again" was sometimes displayed in the folder context menu when it should not have been
  • Multiple message drafts or message templates could not be opened simultaneously for editing
  • Tools > Filters dialog did not open in Unified Folder view if no messages were selected
  • Printing dialog could be opened, even with no messages selected
  • "From" address was editable when creating a new message from a template if the account identity contained Unicode characters
  • Opening a saved .eml file in compose window did not preserve message subject from file
  • Replying to some plaintext messages with desired quote selected in original message did not preserve formatting of quote
  • "Edit as New", "Reply", and "Redirect" could not be used on multiple messages simultaneously
  • "Reply to List" option was always enabled, even with no list to reply to
  • "Archive" button in message pane was enabled on messages that could not be archived
  • "Followup-To" label was incorrectly labeled as "Newsgroups"
  • "Save image as" option did not work for RSS feed items displayed as a webpage
  • OTR verification dialog was blank, preventing verification of OTR chat sessions
  • Calendar ICS parser improvements for more reliable event import
  • Permission description strings were missing from Add-Ons Manager
  • Various visual fixes
  • Security fixes

New in Thunderbird 115.3.3 (Oct 19, 2023)

  • Fixes:
  • Modifier keys did not work as expected when dragging a message over the folder tree on macOS
  • "Folder Location" toolbar button did not work for local folders
  • "Copy to again" option disappeared from context menu after copying to Gmail folder with non-ASCII name
  • Default reply identity did not use "Delivered-To" address when catch-all was active
  • "View Headers All" did not work when selected in standalone message window
  • Viewing the mail filter log displayed an error if no log file was present

New in Thunderbird 115.3.2 (Oct 11, 2023)

  • Fixes:
  • "Open in conversation" did not open messages in a thread view
  • News messsage with non-ASCII author name were incorrectly canceled
  • Localized "Re: " prefix was not stripped from news messages
  • Thunderbird attempted to load accounts missing server hostname, causing blank 3-pane window
  • Permission description strings were missing from Add-Ons Manager
  • Card View displayed incorrect recipient name for mail and news accounts, depending on folder
  • Spell check dictionary dialog sometimes pushed Close button out of view
  • Importing calendars from iCal files did not work under certain circumstances
  • Calendar invitations were not sent to event participants, only organizer
  • Calendar alarm dialogs with lengthy descriptions pushed buttons out of view
  • Various visual fixes

New in Thunderbird 115.3.1 (Sep 30, 2023)

  • Fixes:
  • In Unified Folders view, some folders had incorrect unified folder parent
  • "Edit message as new" did not restore encrypted subject from selected message
  • Importing some CalDAV calendars with yearly recurrence events caused Thunderbird to freeze
  • Security fixes

New in Thunderbird 115.3.0 (Sep 27, 2023)

  • Fixes:
  • Thunderbird could not import profiles with hostname ending in dot (".")
  • Message header was occasionally missing in message preview
  • Setting an existing folder's type flag did not add descendant folders to the Unified Folders view
  • Thunderbird did not always delete all temporary mail files, sometimes preventing messages from being sent
  • Status bar in Message Compose window could not be hidden
  • Message header was intermittently missing from message preview
  • OAuth2 did not work on some profiles created in Thunderbird 102.6.1 or earlier
  • In Vertical View, decrypted subject lines were displayed as ellipsis ("...") in message list
  • Condensed address preference (mail.showCondensedAddresses) did not show condensed addresses in message list
  • Spam folder could not be assigned non-ASCII names with IMAP UTF-8 enabled
  • Message header was not displayed until images finished loading, causing noticeable delay for messages containing large images
  • Large SVG favicons did not display on RSS feeds
  • Context menu items did not display a hover background color

New in Thunderbird 115.2.3 (Sep 21, 2023)

  • Changes:
  • Card view and vertical layout are now default for new profiles
  • Fixes:
  • Go > Folder menu was disabled
  • "Tools" menu was blank when opened from compose window on macOS
  • Deleting an attachment from a message on an IMAP server corrupted the local copy when configured with "mark as deleted"
  • Manually entered passwords were not remembered for OAuth-authenticated accounts such as Yahoo mail
  • Quick Filter's "Keep filters applied" did not persist after restarting Thunderbird
  • Top-level Quick Filter settings did not persist after restart
  • Notifications for new messages with non-ASCII characters in the subject were garbled
  • "Mark Thread As Read" did not work when some messages in thread were already read
  • New Groups tab in NNTP subscribe dialog id not work as expected
  • Negative values were allowed in "Share for files larger than" field
  • Thunderbird sometimes crashed when deleting a parent folder with subfolders
  • "Send Message Error" appeared intermittently while Thunderbird was idle
  • Focused but not selected messages were missing visual indication of focus in card view
  • Notification dot did not disappear from taskbar icon on Windows after messages had already been read
  • Multiple selected messages could not be opened simultaneously if selection included more than 19 messages
  • Email replies received via BCC incorrectly populated From field with default identity
  • User was not always notified of message send failures in outbox
  • Tag dialog did not close properly after editing tag
  • Newsgroup field in compose window did not autocomplete with suggested newsgroup names
  • Canceling newsgroup messages did not check if sender matched user's own identity
  • Event dialog with several invitees expanded beyond screen height
  • Message check boxes were partially obstructed in message list

New in Thunderbird 115.2.2 (Sep 14, 2023)

  • Fixes:
  • Security fixes

New in Thunderbird 115.2.1 (Sep 14, 2023)

  • What’s New:
  • Column separators are now shown between all columns in tree view
  • Fixes:
  • Crash reporter did not work in Thunderbird Flatpak
  • New mail notification always opened message in message pane, even if pane was disabled
  • After moving an IMAP message to another folder, the incorrect message was selected in the message list
  • Adding a tag to an IMAP message opened in a tab failed
  • Junk/Spam folders were not always shown in Unified Folders mode
  • Middle-clicking a folder or message did not open it in a background tab, as in previous versions
  • Settings tab visual improvements: Advanced Fonts dialog, Section headers hidden behind search box
  • Various visual and style fixes

New in Thunderbird 115.2.0 (Aug 30, 2023)

  • What’s New:
  • Thunderbird MSIX packages are now published on archive.mozilla.org
  • Changes:
  • Size, Unread, and Total columns are now right-aligned
  • Newsgroup names in message list header are now abbreviated
  • Fixes:
  • Message compose window did not apply theme colors to menus
  • Reading the second new message in a folder cleared the unread indicator of all other new messages
  • Displayed counts of unread or flagged messages could become out-of-sync
  • Deleting a message from the context menu with messages sorted in chronological order and smooth scroll enabled caused message list to scroll to top
  • Repeatedly switching accounts in Subscribe dialog caused tree view to stop updating
  • "Ignore thread" caused message cards to display incorrectly in message list
  • Creating tags from unified toolbar failed
  • Cross-folder navigation using F and N did not work
  • Account Manager did not resize to fit content, causing "Close" button to become hidden outside bounds of dialog when too many accounts were listed
  • Remote content exceptions could not be added in Settings
  • Newsgroup list file did not get updated after adding a new NNTP server
  • "Download all headers" option in NNTP "Download Headers" dialog was incorrectly selected by default
  • "Convert to event/task" was missing from mail context menu
  • Events and tasks were not shown in some cases despite being present on remote server
  • Various visual and UX improvements
  • Security fixes

New in Thunderbird 115.1.1 (Aug 16, 2023)

  • Fixes:
  • Some HTML emails printed headers on first page and message on subsequent pages
  • Deleting messages from message list sometimes scrolled list to bottom, selecting bottommost message
  • Width of icon columns (like Junk or Starred) in message list did not adjust when UI density was changed
  • Old OpenPGP secret keys could not be used to decrypt messages under certain circumstances
  • When multiple folder modes were active, tab focus navigated through all folder mode options before reaching message list
  • Unread message count badge was not displayed on parent folders of subfolder containing unread messages
  • "Undo archive" (via Ctrl-Z) did not un-archive previously archived messages
  • "New" button dropdown menu in "Message Filters" dialog could not be opened via keyboard navigation
  • "Show New Mail Alert for" input field in "Customize New Mail Alert" dialog had zero width when using certain language packs
  • "Account Wizard" dialog was too narrow when adding a news server, partially hiding confirmation buttons
  • Link Properties and Image Properties dialogs in the composer were too wide
  • Thunderbird version number and details in "About" dialog were not automatically read by screen readers when first opening dialog
  • Flatpak improvements and bug fixes
  • Various visual and UX improvements

New in Thunderbird 115.1.0 (Aug 2, 2023)

  • Changes:
  • Quick Filter bar is now hidden by default
  • Mail tab toolbar and Unified toolbar heights adjusted to be more consistent
  • Fixes:
  • Message-ID header used account domain instead of "From" field domain
  • Zooming did not work in multi-message view
  • "Clear Recent History" dialog did not resize correctly to fit content
  • Tooltip containing full message title did not appear when hovering over message in card view
  • Message List column headers became transparent in increased contrast mode
  • Message List card padding was incorrect in compact view
  • Total message counts and folder sizes were also hidden when "Hide Local Folders" was selected in Folder Pane options
  • Messages in deeply nested IMAP folders were inaccessible
  • Thunderbird Flatpak could not be executed from terminal using command "thunderbird"
  • CardDAV address book dialog did not resize properly to show all available address books
  • Various visual and style fixes

New in Thunderbird 115.0.1 (Aug 2, 2023)

  • Changes:
  • Added Thunderbird Supernova branding to about:dialog
  • Fixes:
  • Message list was not updated when message was deleted from server outside of Thunderbird
  • Scrolling behaved unexpectedly when moving to next message unread message in another folder
  • Scrolling animation was unnecessarily used when switching or toggling the sort column in message list
  • Attempting to delete a message and then cancelling the action still marked the message as read
  • Unified Toolbar could not be customized under certain tabs
  • Selecting a folder with one or more subfolders and pressing enter did not expand folder
  • Tooltips did not appear when hovering over folders
  • Deleting large amounts of messages from Trash folder consumed excessive time and memory
  • Message Summary header buttons were not keyboard accessible
  • "New" button in Message Filters dialog was not keyboard accessible
  • Backing up secret keys from OpenPGP Key Manager dialog silently failed
  • Various visual and UX improvements
  • Security fixes

New in Thunderbird 115.0 (Jul 12, 2023)

  • New Unified Toolbar:
  • There is now a single “Unified Toolbar” on top of the Tabs Bar, which is fully screenreader and keyboard accessible. This toolbar is used for all “Spaces”, which are Mail, Address Book, Calendar, Tasks, Chat and Settings. The toolbar is customizable by right clicking (control click on macOS) > Customize....
  • Customize... offers a common set of buttons available for all “Spaces”, which correspond to the Spaces Toolbar Introduced in 102. Also available are Spaces-specific buttons for each Space.
  • Full keyboard navigation includes Tab and arrow keys to navigate, Enter to add a button to the toolbar, Delete to remove it, and Alt with arrow keys to move buttons around on the toolbar, in addition to mouse actions such as drag and drop.
  • Please refer to Unified Toolbar for more details on the Unified Toolbar and customizations.
  • We are working on improving the other toolbars (e.g. composer, message window, event editor, etc.) for a future release.
  • Simplified Application Menu:
  • The Application Menu (also known as appmenu or “Thunderbird Menu”), ≡, has been simplified and reduced to make it easier to navigate. Only global context items are listed, which do not need to be updated or changed based on which Thunderbird “Space” you are using. There are now at most two layers of submenus so you no longer need to dig around in multiple sublevels to find what you need.
  • Of course, you can still find other menu items in the Thunderbird menu bar by pressing the ALT key on Windows and Linux (and in the macOS Thunderbird menu bar).
  • Improved Message List:
  • The message list now uses modern HTML technology which is faster and has a whole host of behind the scenes improvements to make improving it in the future much easier.
  • A new Message List Header shows the current folder name, number of messages, Quick Filter, and new “Message list display options” icon, [Image:tb115-display-options-icon-offical-from-micah]] .
  • The Vertical View Layout now defaults to a new two line “Card View” which is more compact and better suited to the Vertical Layout. With the customization options, you can change the Vertical View back to the version 102 “Table View”.
  • Calendar Improvements:
  • To summarize, there is an improved “mini-month” layout, a Unified Toolbar for the Calendar “Space” on top of the tabs, improvements to the day/week/month grid, and some other minor changes.
  • Look and Feel Improvements: New Message Button, Get messages, Folder pane options meatball menu
  • All the buttons in the Folder Pane and Unified Toolbars have been revamped using modern CSS and HTML Technology. The buttons are now more accessible and customizable.
  • Many menus and buttons have been moved and changed to be closer to where they are more relevant in the context of Thunderbird. One example is the new Folder Modes sub menu which is documented below.
  • Miscellaneous but important improvements:
  • There is a new + New Message button to compose a new email, chat message, etc. that replaces the old Write button.
  • There is a new "Get messages" icon to the left of + New Message. This new icon replaces the old Get Messages button.
  • There is a new Folder pane options menu also known as a "meatball" or "three horizontal dots" menu, ⋯, to the right of + New Message. This menu has options to show the Total message count, Folder Size and hide the "Get Messages" and "New Message" icons as well as hide the Local Folders and Folder Pane Header. It also has a Folder Modes sub menu. This sub menu replaces the 102 ⋯ menu at the top of the "Folder Pane" toolbar.
  • Other Look and Feel Improvements:
  • In the Mail Space, the "Quick Filter" icon that toggles between hiding or showing the Quick Filter Toolbar' is always visible (in prior versions it became invisible when you removed it via customization).
  • There is a new tabular view in Address Book.
  • "Touch” has been removed from ≡ > Density. It’s now Compact, Default and Relaxed, before 115, it was Compact, Normal, Touch.
  • A new Card View for messages can be turned on by clicking the new "Message list display options" icon (which is on the right of the "Quick Filter" icon): tb115-display-options-icon-offical-from-micah > Cards View . Please see: Getting Started with the Thunderbird main window (Supernova and newer).

New in Thunderbird 102.13.0 (Jul 9, 2023)

  • Changes:
  • Release notes opened from about: dialog will now open in the default web browser
  • Fixes:
  • Upstream RNP version numbers now recognized as official in about:support
  • Security fixes

New in Thunderbird 102.12.0 (Jun 14, 2023)

  • Fixes:
  • "Searching the directory for recipients certificates" popup could block compose window when "S/MIME reminder" was enabled and using an LDAP address book
  • Some elements still used animations with "prefers-reduced-motion" set
  • Visual and theme improvements
  • Security fixes

New in Thunderbird 102.11.2 (May 27, 2023)

  • Fixes:
  • Thunderbird 102.11.1 contained POP3 client regressions with offline mode and TLS certificate overrides

New in Thunderbird 102.11.1 (May 25, 2023)

  • Fixes:
  • POP message retrieval stopped after a network error occurred and connectivity was restored
  • Reused SMTP connections sometimes silently disconnected, causing timeouts
  • Thunderbird could freeze if saving a sent message to IMAP failed
  • Creating OpenPGP keys with no expiration was not possible
  • News reader did not always issue GROUP command after authentication with remote server, preventing Thundebird from displaying or refreshing news from the server

New in Thunderbird 102.11.0 (May 16, 2023)

  • Fixes:
  • During Account Setup, the "Checking password..." message was not removed after a failure
  • Miscellaneous UI fixes
  • Security fixes

New in Thunderbird 102.10.1 (Apr 25, 2023)

  • Fixes:
  • Messages with missing or corrupt "From:" header did not display message header buttons
  • Composer repeatedly prompted for S/MIME smartcard signing/encryption password
  • Address Book integration did not work with macOS 11.4 Bug Sur
  • Mexico City DST fix in Thunderbird 102.10.0 (bug 1826146) was incomplete

New in Thunderbird 102.10.0 (Apr 12, 2023)

  • Changes:
  • New messages will automatically select S/MIME if configured and OpenPGP is not
  • Fixes:
  • Calendar events with timezone America/Mexico_City incorrectly applied Daylight Savings Time
  • Security fixes

New in Thunderbird 102.9.1 (Mar 29, 2023)

  • Fixes:
  • Thunderbird was unable to open file URLs from command line (URLs beginning with "file://")
  • Source strings for localized builds not uploaded to FTP as expected
  • Visual and theme improvements
  • Security fixes

New in Thunderbird 102.9.0 (Mar 21, 2023)

  • Fixes:
  • Notification about a sender's changed OpenPGP key was not immediately visible
  • TLS Certificate Override dialog did not appear when retrieving messages via IMAP using "Get Messages" context menu
  • Spellcheck dictionaries were missing from localized Thunderbird builds that should have included them
  • Tooltips for "Show/Hide" calendar toggle did not display
  • Various security fixes

New in Thunderbird 102.8.0 (Feb 16, 2023)

  • What’s New:
  • Added option to build RNP library with OpenSSL backend (use "--with-librnp-backend=openssl" configure option)
  • Changes:
  • Thunderbird now warns user that OpenPGP is disabled if RNP library is outdated or missing
  • Fixes:
  • "Get Messages" did not retrieve messages from Gmail accounts using a local folder as a deferred inbox
  • Various visual and UX improvements
  • Various security fixes
  • Known Issues:
  • Source strings for localized builds not uploaded to FTP as expected

New in Thunderbird 102.7.2 (Feb 15, 2023)

  • Fixes:
  • Various crash fixes

New in Thunderbird 102.7.0 (Jan 20, 2023)

  • What’s New
  • Enterprise policies now support Thunderbird-specific preferences
  • Fixes:
  • Localized builds and langpacks now use "comm-l10n" repository; downstream builds using official langpacks should not need to make changes
  • Having too many folders open at startup caused loss of MSF files
  • Copying an email from one local folder to another local folder sometimes caused "Another Operation is using the folder" error on Windows 7
  • Email address pill allowed for incorrectly formatted email addresses
  • Creating security exceptions for messages sent using a self-signed certificate failed if hostname contained uppercase letters
  • S/MIME certificate verification was prohibitively slow
  • OpenPGP key import failed for key blocks with comments that contain Unicode characters
  • Chat conversation sidebar was too wide under certain circumstances, making scrollbar unusable
  • On Mac, deleting events from Today Pane with "Backspace" key deleted selected messages instead
  • Various security fixes
  • Known Issues:
  • OAuth2 authentication not working for Microsoft 365 Enterprise accounts. See the Blog post for additional information. Bug 1810760

New in Thunderbird 102.6.1 (Jan 4, 2023)

  • Fixes:
  • Remote content did not load in user-defined signatures
  • Addons that added new action buttons were not shown for addon upgrades, requiring removal and reinstall
  • Various stability improvements
  • Security fix

New in Thunderbird 102.6.0 (Dec 15, 2022)

  • Fixes:
  • Importing secret OpenPGP keys failed when public key with public subkey was already present
  • Message index files were incorrectly deleted when too many folders were opened
  • Thunderbird sometimes incorrectly formatted synced vCards
  • Recurring events did not display past a certain number of repetitions
  • Cookies deleted from the "Show Cookies" dialog were not actually deleted
  • Paused RSS feeds did not actually pause updates
  • Various visual and UX improvements
  • Various security fixes

New in Thunderbird 102.5.1 (Dec 1, 2022)

  • Changes:
  • Mail extension API updates. See Mail Extension API Docs.
  • Fixes:
  • "Copy to again" menu item was not present after copying message to folder with Unicode name on Unicode-enabled IMAP server
  • Calendar date picker was displayed behind "Send Later" window
  • Various security fixes

New in Thunderbird 102.5.0 (Nov 17, 2022)

  • Changes:
  • Ctrl+N shortcut to create new contacts from address book restored
  • Fixes:
  • Account Settings UI did not update to reflect default identity changes
  • New POP mail notifications were incorrectly shown for messages marked by filters as read or junk
  • Connecting to an IMAP server configured to use PREAUTH caused Thunderbird to hang
  • Error responses received in greeting header from NNTP servers did not display error message
  • News messages sent using "Send Later" failed to send after going back online
  • "Download/Sync Now..." did not completely sync all newsgroups before going offline
  • Username was missing from error dialog on failed login to news server
  • Thunderbird can now fetch RSS channel feeds with incomplete channel URL
  • Add-on "Contribute" button in Add-ons Manager did not work
  • Help text for /part Matrix command was incorrect
  • Invite Attendees dialog did not fetch free/busy info for attendees with encoded characters in their name
  • Various security fixes

New in Thunderbird 102.4.2 (Nov 4, 2022)

  • Changes:
  • "Address Book" button in Account Central will now create a CardDAV address book instead of a local address book
  • Fixes:
  • Messages fetched from POP server in Fetch headers only mode disappeared when moved to different folder by filter action
  • Thunderbird re-downloaded locally deleted messages from a POP server when "Leave messages on server" and "Until I delete them" were enabled
  • Multiple password prompts for the same POP account could be displayed
  • IMAP authentication failed on next startup if ImapMail folder was deleted by user
  • Retrieving passwords for authenticated NNTP accounts could fail due to obsolete preferences in a users profile on every startup
  • Get Next n Messages did not consistently fetch all messages requested from NNTP server
  • Get Messages button unable to fetch messages from NNTP server if root folder not selected
  • Thunderbird text branding did not always match locale of localized build
  • Thunderbird installer and Thunderbird updater created Windows shortcuts with different names
  • LDAP search filters unable to work with non-ASCII characters
  • "Today" highlighting in Calendar Month view did not update after date change at midnight

New in Thunderbird 102.4.1 (Oct 27, 2022)

  • What’s New:
  • Thunderbird will now catch and report errors parsing vCards that contain incorrectly formatted dates
  • Fixes:
  • Dynamic language switching did not update interface when switched to right-to-left languages
  • Custom header data was discarded after messages were saved as draft and reopened
  • -remote command line argument did not work, affecting integration with various applications such as LibreOffice
  • Messages received via some SMS-to-email services could not display images
  • VCards with nickname field set could not be edited
  • Some recurring events were missing from Agenda on first load
  • Download requests for remote ICS calendars incorrectly set "Accept" header to text/xml
  • Monthly events created on the 31st of a month with

New in Thunderbird 102.3.3 (Oct 13, 2022)

  • What’s New:
  • Option added to show containing address book for a contact when using All Address Books in vertical mode
  • Changes:
  • Thunderbird will try to use POP NTLM authentication even if not advertised by server
  • Task List and Today Pane sidebars will no longer load when not visible
  • Fixes:
  • Sending a message while a recipient pill was being modified did not save changes
  • Nickname column was not available in horizontal view of Address Book
  • Multiline organization values were displayed across two columns in horizontal view of Address Book
  • Contact vCard fields with multiple values such as Categories were truncated when saved
  • ICS calendar files with a FREEBUSY property could not be imported
  • Thunderbird would hang if calendar event exceeded the year 2035

New in Thunderbird 102.3.2 (Oct 7, 2022)

  • Changes:
  • Thunderbird will try to use POP CRAM-MD5 authentication even if not advertised by server
  • Fixes:
  • Checking messages on POP3 accounts caused POP folder to lock if mail server was slow or non-responsive
  • Newsgroups named with consecutive dots would not appear when refreshing list of newsgroups
  • Sending news articles containing lines starting with dot were sometimes clipped
  • CardDAV server sync silently failed if sync token expired
  • Contacts from LDAP on macOS address books were not displayed
  • Chat account input now accepts URIs for supported chat protocols
  • Chat ScreenName field was not migrated to new address book
  • Creating a New Event from the Today Pane used the currently selected day from the main calendar instead of from the Today Pane
  • New Event button in Today Pane was incorrectly disabled sometimes
  • Event reminder windows did not close after being dismissed or snoozed
  • Improved performance of recurring event date calculation
  • Quarterly calendar events on the last day of the month repeated one month early
  • Thunderbird would hang if calendar event exceeded the year 2035
  • Whitespace in calendar events was incorrectly handled when upgrading from Thunderbird 91 to 102
  • Various visual and UX improvements

New in Thunderbird 102.3.1 (Sep 29, 2022)

  • Changes:
  • Compose window encryption options now only appear for encryption technologies that have already been configured
  • Number of contacts in currently selected address book now displayed at bottom of Address Book list column
  • Fixes:
  • Password prompt did not include server hostname for POP servers
  • Edit Contact was missing from Contacts sidebar context menus
  • Address Book contact lists cut off display of some characters, the result being unreadable
  • Menu items for dark-themed alarm dialog were invisible on Windows 7
  • Various security fixes

New in Thunderbird 102.3.0 (Sep 21, 2022)

  • Changes:
  • Thunderbird will no longer attempt to import account passwords when importing from another Thunderbird profile in order to prevent profile corruption and permanent data loss.
  • Devtools performance profile will use Thunderbird presets instead of Web Developer presets
  • Fixes:
  • Thunderbird startup performance improvements
  • Saving email source and images failed
  • Error message was shown repeatedly when temporary disk space was full
  • Attaching OpenPGP keys without a set size to non-encrypted messages briefly displayed a size of zero bytes
  • Global Search entry box initially contained "undefined"
  • Delete from POP Server mail filter rule intermittently failed to trigger
  • Connections to POP3 servers without UIDL support failed
  • Pop accounts with "Fetch headers only" set downloaded complete messages if server did not advertise TOP capability
  • "File -> New -> Address Book Contact" from Compose window did not work
  • Attach "My vCard" option in compose window was not available
  • Improved performance of matching a contact to an email address
  • Address book only recognized a contact's first two email addresses
  • Address book search and autocomplete failed if a contact vCard could not be parsed
  • Downloading NNTP messages for offline use failed
  • NNTP client became stuck when connecting to Public-Inbox servers
  • Various visual and UX improvements
  • Various security fixes

New in Thunderbird 102.2.2 (Sep 8, 2022)

  • Changes:
  • Setting added to change Calendar event double-click action to open Edit Event dialog rather than view only; Set calendar.events.defaultActionEdit to true.
  • Fixes:
  • Running Compact Folders on maildir folders caused a redownload of all messages in the folder
  • Accessing mail folders in profiles with many folders was slow
  • SMTP servers were not always properly initialized, and were not listed in Account Settings
  • APOP authentication unsupported when connecting to POP3 server
  • OpenPGP key discovery failed
  • POP accounts hosted by AOL were not able to authenticate using OAuth2
  • Unable to open context menu in newsgroups header for groups that are not subscribed

New in Thunderbird 102.2.1 (Sep 1, 2022)

  • What’s New:
  • Commandline argument to open Calendar at startup added (-calendar)
  • Changes:
  • Buttons to connect automatically discovered Address Books and Calendar during Account Setup now displayed
  • Fixes:
  • Compacting IMAP folders failed when "Just mark as deleted" was set
  • Message threading status and sort order was not transferred when applying column layout to other folders
  • Folder names with half-width Kana characters were displayed incorrectly
  • Digital signing of messages was not disabled after switching to an identity that could not sign
  • POP message retrieval stopped after a network error occurred and connectivity was restored
  • Activity Manager didn't show "Get Messages" activity when "Leave messages on server" was turned off and no new messages were found
  • Mail quota color did not update properly for multiple accounts
  • Profile export failed if an expected file did not exist
  • Check Spelling dialog could exceed screen size when many dictionaries were available
  • Dragging a news message to the Desktop caused Thunderbird to hang when synchronized for offline use
  • Remove All Expired Articles was not displayed on expired NNTP messages
  • Sending messages to encrypted Matrix rooms failed in some cases
  • Adding a CalDAV calendar on BSD-based OS's failed due to DNS errors
  • Various visual and UX improvements
  • Various security fixes
  • Known Issues:
  • "Get Map" feature missing from address book for physical addresses
  • unresolved
  • No dedicated "Department" field in address book

New in Thunderbird 102.2.0 (Aug 25, 2022)

  • What’s New:
  • Config setting added to disable OpenPGP "encryption is possible" reminder: mail.openpgp.remind_encryption_possible
  • Changes:
  • Thunderbird on macOS will now prompt for Primary Password on startup if set
  • Thunderbird will no longer offer to import OpenPGP keys that are incomplete
  • Selecting or unselecting a dictionary in the Spelling compose toolbar button will no longer immediately close the menu; Making dictionary changes via the editor context menu will continue to close the context menu
  • Contact address lines are now adjusted to appear in the expected order
  • Custom1-4 fields restored to Address Book UI; existing data is preserved from pre-102 profiles
  • Fixes:
  • Thunderbird startup performance improvements
  • ALT+ keypress events were intercepted by the Spaces Toolbar, preventing special character entry on Windows
  • Searching on attachment status did not work in Message Search dialog
  • Repairing IMAP folders in Offline mode removed local copy of the folders
  • POP3 message download progress bar was not displayed
  • POP Fetch headers only mode did not work for some server configurations
  • POP accounts using GSSAPI or NTLM authentication were not able to log into the server
  • A TLS certificate override dialog for self-signed certificates was not shown for IMAP accounts
  • Saving attachments from newsgroups did not work
  • Setting contact type to "None" was not possible if a type was previously set
  • Editing a contact without Name fields populated filled in the email address into the name fields
  • Address book toolbar buttons were not keyboard accessible
  • Auto-detection of CalDAV and CardDAV via DNS records used server domain leading to failures
  • Various visual and theme improvements
  • Various security fixes
  • Known Issues:
  • "Get Map" feature missing from address book for physical addresses
  • No dedicated "Department" field in address book

New in Thunderbird 102.1.1 (Aug 7, 2022)

  • Changes:
  • OpenPGP Key Manager will clear selected keys after a deletion is performed
  • Fixes:
  • Update notification popups were still displayed after switching to another desktop workspace on Linux
  • macOS display issues made Thunderbird unusable
  • OpenPGP public key was not automatically attached after enabling encryption from reminder and default setting is "Do not encrypt"
  • Importing OpenPGP keys stored in binary format failed
  • Exporting an OpenPGP public key from Account Settings failed
  • Saving encrypted OpenPGP attachments created corrupt files
  • Receiving many OpenPGP keys in a single email caused Thunderbird to hang
  • POP3 message download progress bar was not displayed
  • OAuth2 authentication was not available when the mail domain did not match the OAuth provider domain
  • OAuth did not work with some POP servers
  • RSS feed URL links in headers panel could not be activated by keyboard
  • Self-signed TLS certificates did not work with POP3 connections
  • Non-ascii characters in passwords did not work with POP3 connections
  • An error was not displayed when an incorrect password was entered for a POP3 account
  • NNTP articles were not displayed in preview pane when a Primary Password was set
  • NNTP articles did not download when the hostname of the server was not all in lower-case
  • Saving NNTP messages to local disk failed
  • Drag and Drop from Address Book into Compose window sometimes added unexpected contacts to the target
  • "Default" label not shown for emails when editing a contact
  • Contact Title, Role, and Organization fields could be displayed in the wrong order
  • Contact birthdays on February 29 were displayed incorrectly in non-leap years
  • Detection of photos in vCards improved
  • Drag and drop contacts to another address book was not available
  • Contacts stored in a Google CardDAV address book contained extra backslashes in text fields
  • Contacts without First/Last/Display Names appeared blank in contact list
  • Auto-attaching vCard and OpenPGP keys did not always work as expected
  • Settings page used caused excessive CPU usage
  • Calendar did not respect Date and Time Formatting in Settings
  • OpenPGP Key Import wizard did not adapt to dark theme
  • Various visual and theme improvements
  • Various accessibility improvements
  • Known Issues:
  • "Get Map" feature missing from address book for physical addresses
  • Custom fields missing from address book
  • No dedicated "Department" field in address book

New in Thunderbird 102.1.0 (Aug 2, 2022)

  • Fixes:
  • Activity Manager did not display POP message downloads
  • Mail Folder Properties dialog was not sized correctly, cutting off contents
  • Expired news messages did not display an error
  • Calendar Column Picker closed prematurely after selecting/deselecting a single column
  • Various UI improvements
  • Various security fixes

New in Thunderbird 102.0.3 (Jul 20, 2022)

  • Changes:
  • Support for Google Talk chat accounts removed
  • Fixes:
  • Thunderbird could crash on startup on Windows 11
  • After compacting folders, new downloaded messages were inaccessible
  • Marking a message as a Favorite (starred) did not update the thread pane when using Unified Folders
  • Compose window failed to populate some fields when S/MIME was configured
  • Non-text attachments has an incorrect "charset=windows-1250" mime header
  • Messages sent as attachments incorrectly had an "X-Mozilla-Cloud-Part" header
  • Improved Address Book import/export support in Profile Importer
  • IMAP stability improvements
  • Offline cache was unusable for NNTP accounts
  • Signing S/MIME messages failed
  • Various UI improvements

New in Thunderbird 102.0.2 (Jul 12, 2022)

  • Changes:
  • Double-clicking chat messages will no longer execute a default action
  • Fixes:
  • "File" menu was covered by Spaces Toolbar
  • Sub-folders with new messages were not highlighted until clicked
  • Attachment paper clip was cut off in message list
  • OpenPGP signatures were broken when "Primary Password" dialog remained open
  • Non-ASCII messages forwarded as attachments were garbled
  • Importing from Seamonkey or Outlook failed in second step
  • Deleting messages from a POP server occasionally failed
  • Offline cache was unusable for NNTP accounts
  • News messages were not shown in preview pane
  • Address fields were not populated when using "Edit as new message"
  • Sometimes only the first letter of a contact's Organization name was displayed
  • Double-click to edit selected contacts action did not work
  • Some CardDAV contact fields were displayed with additional backslashes in the value
  • Pending chat message contents were not updated when the conversation was not selected
  • Various UI improvements

New in Thunderbird 102.0 (Jun 29, 2022)

  • What’s new:
  • Thunderbird will now display a message when an upgrade migration task is taking a long time to complete
  • es-MX localized build now available
  • What's link displayed in About: dialog
  • Profile Import/Export UI refreshed and moved to a tab
  • Commandline tools now included for OpenPGP debugging
  • Thunderbird may now be built with OpenPGP support and a system librnp
  • Added menu option to permanently decrypt OpenPGP encrypted messages to a folder
  • OpenPGP: Public keys from email attachments and autocrypt headers now cached for future use
  • Expired OpenPGP recipient keys now indicated in compose window
  • OpenPGP Key Assistant enabled by default
  • OpenPGP Key Properties now supports refreshing keys from key server
  • Spaces vertical toolbar for easier in-app navigation
  • Compose toolbar button for OpenPGP & S/MIME signing available via "Customize Toolbar"
  • "Select all addresses" now supported from composer pill context menu
  • Multiple active spelling dictionaries now supported in compose window
  • Add dictionaries item added to Spelling button in compose window
  • Added config option to more aggressively warn sender about having many public recipients to an email (mail.compose.warn_public_recipients.aggressive)
  • Exporting current profile now supported on importing tab
  • Back/Forward keyboard shortcuts added to Addon Manager
  • Address Book UI and significant backend overhaul
  • Importing sqlite address books now supported
  • Importing addressbooks via CSV file now supports semi-colon (;) delimited files
  • Opening a s:// URL now works if an account is not configured for that s server
  • Google Talk chat accounts now support logging in with OAuth2
  • Matrix chat support enabled by default. This is a beta feature.
  • Printing using the system dialog without preview now supported; Set print.prefer_system_dialog to true
  • Removing events from a calendar now prompts for confirmation
  • Upcoming events in the Today Pane show how far away they are
  • Icons now displayed on recurring events and modified events within a recurring series
  • Changes:
  • SMTP client will now ignore socket errors after QUIT command is sen
  • Javascript POP implementation enabled by default
  • Buttons on "Update Failed" popup now open Beta and Release specific pages on Thunderbird website
  • Replace "About Junk Mail" dialog with a link to the support page
  • macOS] Account settings moved to application menu
  • profiles will default to using "Threaded" message view
  • "Discover OpenPGP Key" context menu item is no longer displayed when a key is already available
  • Duplicated OpenPGP encrypted attachments were shown when display-attachments-inline was enabled
  • Replaced Security compose toolbar button with Encryption toggle and Encryption options buttons
  • OpenPGP dialog for key "acceptance per email" now displayed in more circumstances
  • OpenPGP Key Manager dialog layout improvements
  • Writing OpenPGP keyring data will block Thunderbird shutdown to prevent data loss
  • When automatically attaching OpenPGP keys to emails, Thunderbird will strip key certificates
  • A notification bar in the compose window will be displayed if encryption is possible but not enabled
  • Inline attachment filenames now sent without data-uri encoding
  • Per-recipient and per-domain email format preferences removed; Sending options moved to Compose Settings
  • Thunderbird can now be used without setting up a mail account
  • NNTP account set up moved to its own wizard; "Other accounts" wizard removed
  • Account Manager UI updated
  • Email account provisioner moved to a tab
  • Link to create a email address in Account Setup now hidden if "Email address" contains a value
  • Addon Search will no longer display addons that are incompatible
  • Searching from the Themes page of Addon Manager will now limit search results to only include themes
  • Additional fields for download limits, expiration, and password protection added to FileLink template
  • FileLink will check the provider for sufficient space before uploading
  • "PreferMailFormat" property removed from addressbook
  • Address book contact data is now stored in the vCard format. The change isn't backwards-compatible; backups are stored in the profile directory.
  • Default install directory for Thunderbird Beta to not conflict with release versions
  • Tab icons updated
  • Message Header toolbar buttons will not display a border when set to show icons only
  • message detection for non-INBOX IMAP folders improved
  • Javascript NNTP implementation enabled by default; Set mails.nntp.jsmodule to false to disable
  • Preference for OTR encrypted conversation logging moved to Protocol settings
  • Thunderbird will not try to use OTR Chat encryption if the protocol supports native encryption
  • Invitations to IRC and XMPP chat rooms will now prompt the user if they would like to join
  • Today Pane UI refreshed
  • Thunderbird will not support "Secondly" or "Minutely" recurring calendar events
  • Default action of Edit button in recurring event dialog to display submenu
  • Support for importing and exporting calendars from Outlook CSV format was removed
  • Thunderbird will now delay refreshing cached calendars at start-up
  • Javascript Ical parser (ical.js) enabled by default
  • Fixes:
  • Opening "cid:" links failed
  • Message download progress was calculated incorrectly
  • Ctrl+mouse wheel did not zoom in the message source window
  • Open message in containing folder did not work for standalone windows
  • Multi-message view was not fully scrollable
  • Messages did not reload in all open windows after Junk status was
  • Detached attachments were opened from a temporary copy instead of the selected save location
  • IMAP folder subscription changes on servers using OAuth2 authentication were not reflected in folder pane until Thunderbird was restarted
  • Improved error reporting for external GnuPG configurations
  • Incorrect OpenPGP preferences were used for secondary identities
  • Adding an expiry date to an OpenPGP key that did not have one was not possible
  • UI showed old OpenPGP key expiry date after changing it
  • Importing large OpenPGP key files failed
  • OpenPGP "Repair Message" button did not work with some emails
  • Importing OpenPGP public keys without a blank line following the header failed
  • Dragging and dropping multiple email attachments between windows did not always copy all attachments
  • Attachment bar in message compose window was not keyboard accessible
  • Triggering recipient pill creation in the compose window incorrectly used the entire field as input
  • Compose notification bars were not easily accessible via keyboard
  • "Save message" confirmation dialog buttons were not navigable using arrow keys
  • Focus jumped in compose window when closing the contacts sidebar
  • Save dialog was incorrectly shown when closing empty composer windows
  • Incorrect access key used for File->->Message menu item
  • Changing focus in the compose window with multiple recipient pills selected did not always deselect the pills
  • Sending a message with non-ascii characters in recipient local parts failed unexpectedly when the server did not support SMTPUTF8
  • LDAP Autoconfig could block Thunderbird startup
  • Improvements to the Import/Export feature
  • Configuring multiple SMTP accounts using the same server was not possible
  • Empty Trash on Exit did not work with IMAP accounts using OAuth2 authentication
  • IMAP server hostname changes were not reflected in Folder Properties dialog
  • Addons automatically updated when Thunderbird updated despite Addon updates being turned off
  • Message size calculations incorrectly included FileLink attachments
  • After converting a FileLink attachment back to an e-mail attachment, the privacy notification persisted
  • A failed FileLink provider change removed the attachment completely
  • Subscribing to CardDAV address books from Account Setup tab did not subscribe to all selected address books
  • Adding CardDAV address books failed if an addon-provided address book was present
  • Messages with Message-Id headers longer than 332 characters could not be forwarded
  • SMTP send progress bar could trigger high CPU usage when the server connection failed
  • Improved POP server authentication detection during Account Setup
  • s folders did not display biff indicator
  • IMAP flag changes from another client were not seen after some inactivity
  • Recipients were not de-duplicated before sending, leading to sending errors
  • Chat conversations' context menu did not recognize links
  • Chat username splitting in the account wizard did not work after changing protocols
  • Removing obsolete proprietary chat accounts did not work
  • OTR encrypted chat did not work on FreeBSD
  • Event edit toolbar button was not disabled when an invitation was selected
  • Event view headers and content were not lined up consistently for RTL locales
  • Mini-month views did not properly update at midnight
  • Some labels in Calendar were displayed in multiple languages
  • Thunderbird permitted inline editing of read-only event titles
  • Calendar view reloaded when switching tabs
  • It was possible to create annual calendar events with invalid days
  • Detection of attached vCalendar files improved
  • Reminders for events created by another user could not be closed
  • MS Teams meeting event descriptions were unreadable when stored on Google Calendar
  • Adding a Google calendar with a non-gmail or googlemail e-mail address failed
  • Accepting a recurrence exception to an event accepted event associated with the original recurring event rather than the exception
  • Various security fixes

New in Thunderbird 91.10.0 (Jun 2, 2022)

  • Fixes:
  • Various UX and theme improvements
  • Various security fixes

New in Thunderbird 91.9.1 (May 24, 2022)

  • Fixes:
  • Various security fixes

New in Thunderbird 91.8.1 (May 3, 2022)

  • Fixes:
  • CLIENTID extension to SMTP was not supported by smtp-js
  • Additional SMTP errors now propagated to user
  • OpenPGP was not able to use some previously supported key types
  • OpenPGP Key Manager did not always display correct information after importing additional IDs
  • Duplicate new mail notifications could be displayed when server-side filters were in use
  • Cancelling an SMTP password entry resulted in multiple failure dialogs being displayed

New in Thunderbird 91.8.0 (Apr 6, 2022)

  • Changes:
  • Google accounts using password authentication will be migrated to OAuth2. See KB Article.
  • Fixes:
  • OpenPGP ECC keys created by Thunderbird could not be imported into GnuPG
  • Exporting multiple public PGP keys from Thunderbird was not possible
  • Replying to a newsgroup message erroneously displayed a "No-reply" popup warning
  • Opening mid: URLs on macOS failed
  • Address books stored in older formats were loaded as SQLite files, causing a crash
  • Replicated LDAP directories were lost after switching Thunderbird to "Offline"`mode
  • Importing webcals from the commandline failed if the URI ended with an .ics file extension
  • Various security fixes

New in Thunderbird 91.7.0 (Mar 13, 2022)

  • Changes:
  • Thunderbird will use the first occurrence of headers that should only appear once
  • Fixes:
  • Auto-complete incorrectly changed a pasted email address to the primary address of a contact
  • Attachments with filename extensions that were not registered in MIME types could not be opened
  • Copy/Cut/Paste actions not working in Thunderbird Preferences
  • Improved screen reader support of displayed message headers
  • Various security fixes

New in Thunderbird 91.6.2 (Mar 7, 2022)

  • Fixes:
  • Temporary files from opened attachments were saved with world-readable permission
  • Various security fixes

New in Thunderbird 91.6.0 (Feb 9, 2022)

  • What’s New:
  • Thunderbird will now offer to send large forwarded attachments via FileLink
  • Fixes:
  • Partially signed unencrypted messages displayed an incorrect "partially encrypted" notification
  • Attachments filenames were not sanitized before saving to disk
  • In the attachment bar, the "Import OpenPGP Key" item displayed for public keys displayed an error and did not import the key
  • "Open with" attachment dialog did not have a selected radio button option
  • Various security fixes

New in Thunderbird 91.5.0 (Jan 18, 2022)

  • Fixes:
  • RSS keyword labels without a configured color were illegible
  • Thunderbird "about:" dialog did not identify third-party repackaged distributions such as Flatpaks
  • Various security fixes

New in Thunderbird 91.4.1 (Dec 21, 2021)

  • Fixes:
  • Attachments that should open in Thunderbird, such as ICS attachments, offered to save the file instead
  • Saving attachments from IMAP accounts where usernames contained special characters failed
  • Temporary files created for forwarded attachments sometimes had the wrong extension
  • S/MIME signatures were shown as invalid by Outlook
  • URL input boxes on content tabs erroneously displayed a search glass icon on macOS
  • Message bars (such as content blocking) did not use high contrast theme colors
  • Some messages with autocrypt headers loaded slowly, causing Thunderbird to hang
  • Server hostnames were cut-off in the account manager
  • Account Setup did not support non-ASCII characters in passwords
  • Account Setup did not always retain set values
  • Virtual folders did not retain folder selection when a folder name contained non-ASCII characters
  • Messages saved as "html" or "eml" did not include message headers
  • "Private web page" field was not included when exporting a contact to a vCard
  • Addons were still active after restarting Thunderbird in troubleshooting mode with "disable all addons" checked
  • FileLink attachments did not always display the FileLink provider's icon
  • FileLink privacy notifications persisted in the compose window after removing all FileLink attachments
  • "Loading" icon remained after a FileLink upload failed
  • Lengthy event names for multiday events did not wrap
  • Various theme and UX improvements
  • Various security fixes

New in Thunderbird 91.4.0 (Dec 8, 2021)

  • Fixes:
  • IMAP startup performance improved for accounts with a multitude of folders
  • Thunderbird failed to send messages when configured to use an IPv6 SMTP server by IP address (instead of a hostname)
  • Forwarding messages with attachments sometimes failed
  • Printing multiple messages at once was not possible
  • Non-utf8 news groups were not supported
  • Thunderbird stalled after sending a message with NNTP and SMTP recipients
  • Using Thunderbird with multiple language packs caused high RAM and CPU use and sluggish performance
  • Clicking a "mailto:" started the composer with the default sending identity instead of a configured alternate
  • Drag and dropped text into a plain text message in the compose window was handled inconsistently
  • FileLink messages did not display correctly when viewed in Outlook
  • In account setup, after selecting an extension provided protocol, it was not possible to create an IMAP/POP account
  • Multiday selections were not cleared when changing week viewed
  • When creating a new event by clicking and dragging the mouse to create a box, the view did not auto-scroll after reaching the bottom
  • Calendar Invitation Panel did not scroll when multiple invitations were pending
  • Calendar print dialog did not have a cancel button
  • Various security fixes

New in Thunderbird 91.3.2 (Nov 19, 2021)

  • Changes:
  • Date selection in Calendar print settings widget changed to use mini calendar widget
  • Fixes
  • "Repair Text Encoding" menu item did not work
  • Troubleshoot Mode menu item did not always indicate whether troubleshooting mode was enabled
  • Message content could be unintentionally hidden due to CSS class names conflicting
  • SMTP server port was reset to "0" after clicking the "Re-Test" button in the Account Setup wizard
  • No "Paste" option was available in the config editor (about:config) context menu
  • Saving a PDF attachment opened in a separate tab saved the email message instead
  • Opening a PDF attachment from a message in a standalone or compose window did move the focus to opened attachment
  • After restart, Thunderbird was not able to restore opened message tabs when the message was in a folder with non-ASCII characters in its name
  • The "pill" indicator was incorrectly shown when sending a message to newsgroup
  • When printing from Calendar, after leaving the "Calendar" settings, there was no way to go back
  • Month pickers in the Calendar print UI lacked scrollbars when the content overflowed
  • Account Manager and Addons Manager were unreadable when using the Dark theme

New in Thunderbird 91.3.1 (Nov 15, 2021)

  • Fixes:
  • Default mail headers were set incorrectly when the value contained a colon (:)
  • Thunderbird did not send the QUIT command when closing an SMTP connection
  • Mail tabs could not be closed using the context menu
  • "Print" context menu was still shown when no message pane was displayed
  • Windows tray icon did not reappear after restarting Windows Explorer
  • Compose window attachment drag and drop fixes
  • Various macOS stability improvements
  • Drag and Drop area for file attachments on Windows was incorrect
  • CardDAV address books without a name did not work
  • Thunderbird tried to refresh disabled and manual-only calendars when the network state changed from offline to online
  • Various Calendar event dialog fixes
  • Various security fixes

New in Thunderbird 91.3.0 (Nov 3, 2021)

  • Fixes:
  • Default mail headers were set incorrectly when the value contained a colon (:)
  • Thunderbird did not send the QUIT command when closing an SMTP connection
  • Mail tabs could not be closed using the context menu
  • "Print" context menu was still shown when no message pane was displayed
  • Windows tray icon did not reappear after restarting Windows Explorer
  • Compose window attachment drag and drop fixes
  • Various macOS stability improvements
  • Drag and Drop area for file attachments on Windows was incorrect
  • CardDAV address books without a name did not work
  • Thunderbird tried to refresh disabled and manual-only calendars when the network state changed from offline to online
  • Various Calendar event dialog fixes
  • Various security fixes

New in Thunderbird 91.2.1 (Oct 22, 2021)

  • What’s New:
  • Preference added to disable automatic pausing RSS feed updates after a fetch failure
  • Fixes:
  • Recipeint address pills in an error state could incorrectly merge with mailing list pills when expanding the list
  • BCC-only messages could not be sent from the Outbox
  • Default DSN request was not set when using "Edit as New Message"
  • Vertical scrollbar in "Conversations" chat panel did not work correctly
  • Chat account "Advanced Options" dialog had no clickable buttons on macOS
  • RSS feed attachments could not be saved
  • Public ICS calendars served with an incorrect Content-Type could not be added
  • Setting a CalDAV calendar to manually update had no effect
  • CalDAV calendars set to read-only became writable after restarting Thunderbird
  • Saving a copy of a calendar invite (More -> Save As Copy) did not work
  • Events in the first or last week of a month were not always printed when printing a month view
  • Accessibility improvements; clearer display of area of focus
  • Various theme improvements, HiDPI improvements
  • "Attachments" menu panels for attached files were empty
  • Stability improvements

New in Thunderbird 91.2.0 (Oct 22, 2021)

  • Changes:
  • Saving a single message as .eml now uses a unique filename
  • Fixes:
  • New mail notifications did not properly take subfolders into account
  • Decrypting binary attachments when using an external GnuPG configuration failed
  • Account name fields in the account manager were not big enough for long names
  • LDAP searches using an extensibleMatch filter returned no results
  • Read-only CalDAV calendars and CardDAV address books were not detected
  • Multipart messages containing a calendar invite did not display any of the human-readable alternatives
  • Some calendar days were displayed incorrectly or duplicated (eg. two "29th" days of a particular month)
  • Phantom event was shown at the end of each day in Calendar week view
  • Various security fixes

New in Thunderbird 91.1.2 (Oct 1, 2021)

  • Changes:
  • Thunderbird will now warn if an S/MIME encrypted message includes BCC recipients
  • Fixes:
  • Message Security popup did not display all recipients due a missing scrollbar
  • Delivery Status Notifications were only shown for the first recipient
  • Composing a message from a template with attachments failed due to a temporary file being removed
  • Attachment sizes were no longer included on printed emails
  • A message sent with multiple attachments sometimes only sent one
  • Thunderbird sometimes attached the wrong messages when forwarding multiple messages by attachment
  • Thunderbird did not re-prompt for an SMTP username if one was not provided
  • Messages with BCC recipients that were held in the Outbox did not retain the BCC header when moved to the Sent folder
  • Thunderbird displayed reminders for events that were cancelled or declined
  • New Feed Account dialog did not honor dark mode

New in Thunderbird 91.1.1 (Sep 17, 2021)

  • What’s New:
  • Menu item for disabling subject encryption for a single message added
  • Changes:
  • Printing messages that are not currently displayed is no longer supported, including printing multiple messages at once
  • Fixes:
  • Buttons on compose window dialogs did not have a visual indication of focus
  • Dropdown fields in message compose window were unreadable on Windows 7 with a dark theme
  • Multiple bulk mail notification warnings were displayed
  • Enabled/Disabled state of message filters did not persist as expected
  • Printing a message did not print a list of its attachments
  • Images attached from a web page were not sent as expected
  • OpenPGP public key was attached multiple times when forwading a message
  • Windows tray icon disappeared if Thunderbird was started by a shortcut with "Run" set to "Minimized"
  • Windows tray message count badge displayed the "unread" count instead of the "new" message count
  • Some downstream Thunderbird builds were incorrectly checking addons for a signature, causing all addons to be disabled
  • Addressbooks set up with autoconfig showed no search results
  • Various CardDAV setup and auto-detection fixes
  • Dates (such as birthday) stored in contacts may display the wrong date; a one-time manual fix may be needed for dates that are incorrect.
  • Attached VCards displayed as plain text when an email was HTML formatted
  • Mailing list names with non-ASCII characters incorrectly displayed with an error
  • LDAP directories were not searched for matches when adding recipients to an email
  • Clicking "Connect to an LDAP address book" in account setup opened CardDAV setup dialog
  • LDAP address books using Kerberos/GSS-API authentication did not authenticate
  • LDAP search queries containing non-ASCII characters produced no results
  • IRC server connections did not automatically retry after a timeout
  • Calendar event editor did not honor mail.spellcheck.inline

New in Thunderbird 91.1.0 (Sep 7, 2021)

  • Changes:
  • VCard attachments now sent with "text/vcard" instead of "text/x-vcard"
  • Fixes:
  • Thunderbird registered Accessibility Handlers using same GUIDs as Firefox, causing performance issues for NVDA users
  • Focus lost when reordering accounts by keyboard in the Account Manager
  • Account setup did not use provider display name for setting up calendars
  • Various theme and UX fixes
  • Various security fixes

New in Thunderbird 91.0.3 (Aug 26, 2021)

  • Fixes:
  • Folder icons could be overridden by linked favicons in HTML messages
  • Unified folders showed no messages when underlying folders were removed
  • Folder pane toolbar did not always persist after restarting Thunderbird
  • Compose window attachment pane did not close when disabling signing of an OpenPGP message
  • Using "Reply to List" with some list emails incorrectly opened a "no-reply" warning
  • Unread message count badge on Windows tray icon did not update after moving messages to the Junk folder
  • Account setup UX issues with Exchange autodiscover
  • Account settings did not display non-UTF-8 server descriptions correctly
  • Thunderbird sometimes sent an unnecessary "SMTPUTF8", causing some servers to reject mail
  • No mouseover pop was displayed with event details for non-all-day events in the Today Pane
  • Filtering tasks in the Today Pane did not work
  • Email based event scheduling displayed the date and time in a format unreadable by humans

New in Thunderbird 91.0.1 (Aug 22, 2021)

  • Fixes:
  • OTR chat encryption failed on 32-bit Windows builds
  • Various security fixes

New in Thunderbird 91.0 (Aug 12, 2021)

  • What’s New:
  • Native support for macOS devices built with Apple Silicon CPUs
  • Thunderbird now operates in multi-process (e10s) mode by default
  • Latvian language support
  • New user interface for adding attachments
  • Enable redirect of messages
  • Ability to change order of accounts in UI
  • Allow showing empty CC/BCC rows in compose window
  • Warning popup when sending a reply to a likely non-existant email address such as "[email protected]"
  • Warning popup when public recipients of a message exceeds threshold
  • Add support for "X-Unsent: 1" header, to open a saved email in a compose window for editing
  • Add support for non-ASCII characters in recipient addresses
  • Context menu to expand mail list pills in the compose window to the list of recipients
  • Quick Find is now available in the multi-message (thread summary) view
  • Keyboard shortcuts to access To/CC/BCC fields of compose window
  • Allow pinning folder views to the Folder Pane
  • Language packs and dictionaries added to about:support
  • PDF.js viewer now included in Thunderbird
  • OpenPGP: "Copy Key Id" option added to Key Manager context menu
  • OpenPGP: Added config option to disable encrypting saved drafts
  • Encrypt mail to BCC recipients (with warning that it will expose the recipients in the list of keys)
  • CardDAV address book support
  • CardDAV address books automatically detected based on provided user information
  • Access to Outlook Contacts; To enable, set ldap_2.servers.outlook.dirType to 3; This setting may cause startup delays.
  • Suggest replacements for discontinued/incompatible add-ons
  • Chat: Beta-level support for Matrix servers (set chat.prpls.prpl-matrix.disable to false)
  • Calendar: Remote calendar auto-detection now supported
  • Calendar: Calendar and category colors now displayed in selection dropdowns
  • Calendar: "Edit" item added to event context menu
  • Calendar: Support opening of .ics files by double-click
  • Calendar: Thunderbird now informs the operating system that it knows how to open webcal: URLs
  • Calendar: Filter and sort items to be imported in the Import dialog
  • Prompt to choose the identity of an accepted calendar invite when no identity matches the event attendees list
  • Support mid: URL scheme for Related Links in calendar event dialogs
  • Permissions to access calendar and address book are now requested when a GMail account is set up, so that calendar and address book can be accessed without having to re-authorize (see notes)
  • Calendar: Per-calendar and global notification settings (in addition to alerts set in events)
  • Tasks: Undo/Redo support for event and task creation and deletion
  • Changes:
  • "Master Password" renamed to "Primary Password"
  • Renamed "Add-ons" to "Add-ons and Themes" and "Options" to "Preferences"
  • Account setup moved to a tab
  • Mail recipients that are not found in any address book will no longer appear in red type; invalid addresses will appear red
  • Clicking on an already-selected pill in the recipient list will now allow editing the address
  • Folder pane color scheme overhauled with a focus on readability
  • Sending backend, SMTP protocol, and LDAP protocol implementations rewritten in Javascript
  • Sending backend, SMTP, and IMAP protocols now operate only in UTF-8 mode
  • Sending a message will now fail if any recipients are not accepted by the SMTP server
  • Error messages from an SMTP server are now displayed to the user
  • UI Customization controls moved to the View menu
  • End-to-End Encryption "Advanced Settings" are now disabled when encryption is not configured
  • Movemail support removed
  • WeTransfer FileLink provider removed
  • Enterprise policies updated
  • Printing UI updated
  • AutoComplete from LDAP directories now searches by substring instead of left-side match
  • Chat modules and custom widgets are now lazy-loaded to improve Thunderbird startup time
  • Default IRC server for new chat accounts changed to "libera.chat"
  • Chat: Image based emoticons replaced with Unicode
  • Calendar: Opening an existing event now opens summary dialog
  • Calendar: Default to CalDAV when supported by the server
  • Fixes:
  • Thunderbird did not properly handle Self-signed certificates on IMAP servers
  • Various issues with special and non-ASCII characters in IMAP folders names, especially on Gmail
  • Drag & drop operations could be disrupted by incoming mail notifications
  • Dragging a folder from an authenticated IMAP server to a not-yet authenticated server fails
  • Temporary errors from POP3 servers would cause Thunderbird to stop downloading mail until it was restarted
  • Favorite Folder view did not maintain UI state between Thunderbird restarts
  • Saved search virtual folders were not retained after restarting Thunderbird
  • Thunderbird did not correctly warn about all affected filters when removing a folder
  • Manually running filters on a maildir folder did not work
  • Partially downloaded messages displayed in a stand-alone window did not refresh after clicking link to download the rest of the message
  • An erroneous "Sender" header was displayed in the message preview after viewing certain S/MIME signed emails
  • Some temporary files created by the message composer were not automatically removed after closing the compose window
  • Archiving messages from an NNTP account made the target folder unusable
  • Compose window: The user-configured style for quoted text was not honored
  • Message headers in compose window disregarded manual resizing when adding additional recipients
  • Various improvements to new message notifications
  • A Thunderbird icon pinned to the Windows taskbar reverted to a non-functional placeholder after an update
  • Various improvements to recipient pills in message compose window
  • Keyboard shortcut to open the Message Security popup did not work on Mac
  • Subject column in message lists sometimes showed text from invalid email headers
  • Account settings: When creating a new account, some already entered settings did not copy to the Advanced Config dialog
  • Default address book preference was not honored in the contacts sidebar
  • Import Address Book from CSV did not not allow mapping all available fields
  • LDAP address books did not display multi-valued attributes
  • Address Book: Users with LDAP admin rights could delete accounts if trying to delete an entry from an address book backed by LDAP
  • Some preferences related to an address book were not removed when the address book was deleted
  • Shortcut for Advanced Address Book Search (Ctrl+Shift+F) did not work on Linux
  • Radio buttons could not be selected on photo tab of an address card
  • Windows uninstaller did not always remove all Thunderbird program files
  • Chat: Double clicking an account type in new account wizard did not select it
  • Chat account settings did not always save as expected
  • User nickname colors were not used in chat content
  • Chat: Multiple system messages did not collapse
  • Calendar: Reminder details appeared editable when viewing an event
  • Calendar: HTML rendering in event descriptions restored
  • Calendar: The toolbar in the invitation details dialog was not honoring the theme colors
  • Calendar: Various dialog updates
  • Calendar: Import and export via CSV did not parse years correctly in event dates
  • Calendar: Event boxes were not always focused when clicked
  • Dragging and dropping an ICS file to the Today Pane did not populate the "New Event" dialog
  • Calendar: Reduced flickering effect in Today Pane
  • Calendar: The time of day indicator line did not update automatically
  • Location field was not preserved when modifying recurring events stored on a remote calendar
  • Today was difficult to pick out visually in the month/multiweek calendar views
  • Columns in Today Pane were not resizable
  • Calendar event text could render outside the confines of the event block
  • Event time and event name were not vertically aligned
  • Improved formatting of event descriptions with long links, such as Zoom invites
  • RSVP replies to invitations sometimes sent from the wrong email address
  • Various UI and theme improvements, especially to dark themes
  • Various security fixes

New in Thunderbird 78.13.0 (Aug 12, 2021)

  • Changes:
  • WeTransfer FileLink provider removed
  • The fix for bug 1707360, from Thunderbird 78.12.0, was removed for causing regressions
  • Fixes:
  • OpenPGP: Homebrew's GPG Smartcard libraries not found on M1 Macs
  • Various security fixes

New in Thunderbird 78.12.0 (Jul 14, 2021)

  • Fixes:
  • Sending an email containing HTML links with spaces in the URL sometimes resulted in broken links
  • Folder Pane display theme fixes for macOS
  • Chat account settings did not always save as expected
  • RSS feed subscriptions sometimes lost
  • Calendar: A parsing error for alarm triggers of type "DURATION" caused sync problems for some users
  • Various security fixes

New in Thunderbird 78.11.0 (Jun 3, 2021)

  • Fixes:
  • OpenPGP could not be disabled for an account if a key was previously configured
  • Recipients were unable to decrypt some messages when the sender had changed the message encryption from OpenPGP to S/MIME
  • Contacts moved between CardDAV address books were not synced to the new server
  • CardDAV compatibility fixes for Google Contacts
  • Folder pane had no clear indication of focus on macOS
  • Windows theme improvements
  • Various security fixes

New in Thunderbird 78.10.1 (May 6, 2021)

  • Changes:
  • Removed the fix for bug 1689804 introduced in Thunderbird 78.9.0, restoring the previous behavior
  • Fixes:
  • Various security fixes

New in Thunderbird 78.10.0 (Apr 29, 2021)

  • Fixes:
  • Various security fixes

New in Thunderbird 78.9.1 (Apr 9, 2021)

  • What’s New:
  • Support recipient aliases for OpenPGP encryption. Documentation can be found here.
  • Fixes:
  • The key and signature parts of the message security popup on a received message could not be selected for copy/paste.
  • Various UX and theme improvements
  • Various security fixes

New in Thunderbird 78.8.1 (Mar 9, 2021)

  • Fixes:
  • New mail notification did not occur for newly arrived messages if previously received mail was unread
  • Directory for saving multiple attachments was not remembered between saves
  • Opening a message from the command-line using "-mail " failed
  • Automatic account setup did not use the provider email and display name
  • Newly-added identities were not listed in the account manager until it was closed and reopened
  • Account provisioner did not properly handle UTF-8 data
  • Copying a large message to an IMAP server would sometimes prematurely display a time-out error
  • OpenPGP: Various errors when importing keys
  • OpenPGP: Public keys attached to an outgoing email did not have "Content-Description" set
  • Address Book: CardDAV sync errors did not retry until Thunderbird was restarted
  • Calendar: Changing the cache mode of a CalDAV calendar connection would lose the username of the account
  • Calendar: Add-on calendars were sometimes not visible after restarting
  • Calendar: The preview for a recurring task did not use all available space in the dialog window
  • Installer: Option to keep distribution directory on upgrade did not work

New in Thunderbird 78.8.0 (Feb 24, 2021)

  • Fixes:
  • Importing an address book from a CSV file always reported an error
  • Security information for S/MIME messages was not displayed correctly prior to a draft being saved
  • Calendar: FileLink UI fixes for Caldav calendars
  • Recurring tasks were always marked incomplete; unable to use filters
  • Various UI widgets not working
  • Dark theme improvements
  • Extension manager was missing link to addon support web page
  • Various security fixes

New in Thunderbird 78.7.1 (Feb 7, 2021)

  • What’s New:
  • CardDAV address books now support OAuth2 and Google Contacts.
  • Changes:
  • Thunderbird will no longer allow installation of addons that use legacy APIs
  • Fixes:
  • Send message button sometimes remained enabled when it should be disabled
  • Pressing command+enter to send a message on macOS did not work
  • OpenPGP: Failed to save attachments that contained binary data after decryption
  • Global search UI fixes
  • Various theme and color fixes to improve ease of use

New in Thunderbird 86.0 Beta 1 (Jan 29, 2021)

  • What’s New:
  • Allow pinning folder views to the Folder Pane
  • Changes:
  • Message addressees that are not found in any address book will no longer appear in red type; invalid addresses will appear red
  • Reenabled javascript-based message sending code by default
  • Folder pane color scheme overhauled with a focus on readability
  • Calendar: Imported events are not sorted before being displayed
  • Fixes:
  • Thunderbird did not properly handle Self-signed certificates on IMAP servers
  • Pressing command+enter to send a message on macOS did not work
  • Saving an image from a message body with "Save Image As" did not work
  • Various issues with IMAP folders with non-ASCII names, especially on Gmail
  • OpenPGP: Failed to save attachments that contained binary data after decryption
  • Various global search fixes
  • Importing an address book from a CSV file always reported an error
  • Windows uninstaller did not always remove all Thunderbird program files
  • Calendar: HTML entities appeared in event and task descriptions
  • Calendar: FileLink UI fixes for Caldav calendars
  • Calendar: Various dialog updates
  • MailExtension options pages did not always completely load
  • Known Issues:
  • Various updater issues

New in Thunderbird 78.7.0 (Jan 27, 2021)

  • What’s New:
  • Extension API: Compose API now supports editing messages and templates as new messages
  • Extension API: composeHtml is now exposed in MailIdentity
  • Extension API: windows.update and windows.create now support titlePreface
  • Extension API: new Accounts API functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
  • Changes:
  • Extension API: body and plainTextBody are now used as compose mode selectors in setComposeDetails and begin* functions in Compose API
  • Theme: removed the double border around the task description field on the Tasks tab
  • Fixes
  • Account Manager: When deleting the last remaining account, the default account was not getting cleared and still pointed to the no-longer-existing account
  • OpenPGP: Verification of an inline signed message would fail if it contained leading whitespace
  • OpenPGP: Various other minor bug and stability fixes
  • Mail Window: Quickfilter bar buttons disappear when hovered on Windows 10 High Contrast Black theme
  • Theme: folder properties dialog contained black text on a black background in dark mode
  • Theme: recipient pills in compose window were not visible in high contrast dark theme on Windows 10
  • Extension API: browserAction buttons were not restored after restart if they were moved outside the default toolbar
  • Extension API: browser.compose.beginNew could not override identity plaintext setting
  • Extension API: browser.compose.beginForward was ignoring ComposeDetails
  • Extension API: browser.compose.setComposeDetails did not properly handle Windows-style line endings
  • Various security fixes
  • Known Issues:
  • Thunderbird performs sluggishly on macOS Big Sur

New in Thunderbird 78.6.1 (Jan 12, 2021)

  • Changes:
  • MailExtensions: browserAction, composeAction, and messageDisplayAction toolbar buttons now support label and default_label properties
  • Fixes:
  • Running a quicksearch that returned no results did not offer to re-run as a global search
  • Message search toolbar fixes
  • Very long subject lines distorted the message compose and display windows, making them unusable
  • Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button
  • Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything
  • Account autodiscover fixes when using MS Exchange servers
  • LDAP address book stability fix
  • Messages with invalid vcard attachments were not marked as read when viewed in the preview window
  • Chat: Could not add TLS certificate exceptions for XMPP connections
  • Calendar: System timezone was not always properly detected
  • Calendar: Descriptions were sometimes blank when editing a single occurrence of a repeating event
  • Various printing bugfixes
  • Visual consistency and theme improvements
  • Various security fixes

New in Thunderbird 85.0 Beta 3 (Jan 5, 2021)

  • What’s New:
  • If a message fails to send, a message is now logged in the console tab of the Developer Toolbox which identifies which message failed to send
  • Address book: Added support for OAuth2 CardDAV providers
  • Calendar: Thunderbird now informs the operating system that it knows how to open webcal: and webcals: URLs
  • MailExtensions: Added the capability to query a specific headerMessageId via extension API which is persistent across application restarts
  • MailExtensions: new functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
  • Changes:
  • The UI Customization controls formerly in the Customize submenu have all been moved into the View menu
  • Address book: CardDAV is now enabled by default (it was previously behind a hidden preference and off by default)
  • Calendar: Opening an event in the Today pane now opens the event summary
  • Calendar: When creating a new calendar, CalDAV is now used by default when supported by the server
  • MailExtensions: setComposeDetails and begin* functions of compose API now use body and plainTextBody as compose mode selectors
  • MailExtensions: Variable names for accessing notifications have changed
  • MailExtensions: Read-only address books now accessible
  • MailExtensions: messages.list(folder) on a non-existent folder now throws an ExtensionError exception
  • Fixes:
  • Various printing bugfixes
  • Various message search toolbar fixes
  • Address book: Read-only CardDAV address books were writable
  • Address book: Autocomplete suggestions did not appear next to the field when editing address book entries with an IME enabled
  • Address book: Default address book preference was not honored
  • Compose window: The user-configured style for quoted text was not honored
  • Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button
  • Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything
  • Calendar: System timezone was not always properly detected
  • Calendar: The toolbar in the invitation details dialog was not honoring the theme colors
  • Account settings: When creating a new account, some already entered settings did not copy to the Advanced Config dialog
  • Account settings: When updating the title of a news & blogging type account, the title of the tab did not change
  • Chat: Could not add TLS certificate exceptions for XMPP connections
  • MailExtensions: browserActions moved to a different toolbar are now properly displayed after restarting Thunderbird
  • MailExtensions: browser.compose.beginNew was not properly honoring plaintext vs HTML settings
  • MailExtensions: browser.compose.setComposeDetails did not properly handling Windows-style line endings
  • MailExtensions: windows.create and windows.update did not honor the titlePrefix parameter
  • MailExtensions: messages.getFull() did not return all parts with OpenPGP enabled

New in Thunderbird 85.0 Beta 2 (Jan 5, 2021)

  • Fixes:
  • Sending messages and saving drafts with attachments that were copy & pasted into the compose window could fail
  • Calendar: Descriptions were sometimes blank when editing a single occurrence of a repeating event
  • LDAP address book stability fix

New in Thunderbird 85.0 Beta 1 (Dec 20, 2020)

  • What’s New:
  • If a message fails to send, a message is now logged in the console tab of the Developer Toolbox which identifies which message failed to send
  • Address book: Added support for OAuth2 CardDAV providers
  • Calendar: Thunderbird now informs the operating system that it knows how to open webcal: and webcals: URLs
  • MailExtensions: Added the capability to query a specific headerMessageId via extension API which is persistent across application restarts
  • MailExtensions: new functions: accounts.getDefault() and accounts.getDefaultIdentity(accountId)
  • Changes:
  • The UI Customization controls formerly in the Customize submenu have all been moved into the View menu
  • Address book: CardDAV is now enabled by default (it was previously behind a hidden preference and off by default)
  • Calendar: Opening an event in the Today pane now opens the event summary
  • Calendar: When creating a new calendar, CalDAV is now used by default when supported by the server
  • MailExtensions: setComposeDetails and begin* functions of compose API now use body and plainTextBody as compose mode selectors
  • MailExtensions: Variable names for accessing notifications have changed
  • MailExtensions: Read-only address books now accessible
  • MailExtensions: messages.list(folder) on a non-existent folder now throws an ExtensionError exception
  • Fixes:
  • Various printing bugfixes
  • Various message search toolbar fixes
  • Address book: Read-only CardDAV address books were writable
  • Address book: Autocomplete suggestions did not appear next to the field when editing address book entries with an IME enabled
  • Address book: Default address book preference was not honored
  • Compose window: The user-configured style for quoted text was not honored
  • Compose window: Recipient addresses that had not yet been autocompleted were lost when clicking Send button
  • Compose window: New message is no longer marked as "changed" just from tabbing out of the recipient field without editing anything
  • Calendar: System timezone was not always properly detected
  • Calendar: The toolbar in the invitation details dialog was not honoring the theme colors
  • Account settings: When creating a new account, some already entered settings did not copy to the Advanced Config dialog
  • Account settings: When updating the title of a news & blogging type account, the title of the tab did not change
  • Chat: Could not add TLS certificate exceptions for XMPP connections
  • MailExtensions: browserActions moved to a different toolbar are now properly displayed after restarting Thunderbird
  • MailExtensions: browser.compose.beginNew was not properly honoring plaintext vs HTML settings
  • MailExtensions: browser.compose.setComposeDetails did not properly handling Windows-style line endings
  • MailExtensions: windows.create and windows.update did not honor the titlePrefix parameter
  • MailExtensions: messages.getFull() did not return all parts with OpenPGP enabled

New in Thunderbird 78.6.0 (Dec 20, 2020)

  • What’s New:
  • MailExtensions: Added browser.windows.openDefaultBrowser()
  • Changes:
  • Thunderbird now only shows quota exceeded indications on the main window
  • MailExtensions: menus API enabled in messages being composed
  • MailExtensions: Honor allowScriptsToClose argument in windows.create API function
  • MailExtensions: APIs that returned an accountId will reflect the account the message belongs to, not what is stored in message headers
  • Fixes:
  • Keyboard shortcut for toggling message "read" status not shown in menus
  • OpenPGP: After importing a secret key, Key Manager displayed properties of the wrong key
  • OpenPGP: Inline PGP parsing improvements
  • OpenPGP: Discovering keys online via Key Manager sometimes failed on Linux
  • OpenPGP: Encrypted attachment "Decrypt and Open/Save As" did not work
  • OpenPGP: Importing keys failed on macOS
  • OpenPGP: Verification of clear signed UTF-8 text failed
  • Address book: Some columns incorrectly displayed no data
  • Address book: The address book view did not update after changing the name format in the menu
  • Calendar: Could not import an ICS file into a CalDAV calendar
  • Calendar: Two "Home" calendars were visible on a new profile
  • Calendar: Dark theme was incomplete on Linux
  • Dark theme did not apply to new mail notification popups
  • Folder icon, message list, and contact side bar visual improvements
  • MailExtensions: HTTP refresh in browser content tabs did not work
  • MailExtensions: messageDisplayScripts failed to run in main window
  • Various security fixes
  • Known Issues:
  • Thunderbird performs sluggishly on macOS Big Sur

New in Thunderbird 84.0 Beta 3 (Dec 6, 2020)

  • What’s New:
  • MailExtensions: Added browser.windows.openDefaultBrowser()
  • Changes:
  • MailExtensions: APIs that returned an accountId will reflect the account the message belongs to, not what is stored in message headers
  • MailExtensions: browserAction, composeAction, and messageDisplayAction toolbar buttons now support label and default_label properties
  • Fixes:
  • Running a quicksearch that returned no results did not offer to re-run as a global search
  • OpenPGP: When signature verification failed on an unencrypted message, Thunderbird incorrectly reported that the message was encrypted and could not be decrypted
  • Address book: Some columns incorrectly displayed no data
  • Address book: The address book view did not update after changing the name format in the menu
  • Calendar: Dark theme was incomplete on Linux
  • Calendar: Could not import an ICS file into a CalDAV calendar
  • Known Issues:
  • Printing from calendar does not work

New in Thunderbird 78.5.1 (Dec 2, 2020)

  • What’s New:
  • OpenPGP: Added option to disable email subject encryption
  • Changes:
  • OpenPGP public key import now supports multi-file selection and bulk accepting imported keys
  • MailExtensions: getComposeDetails will wait for "compose-editor-ready" event
  • Fixes:
  • New mail icon was not removed from the system tray at shutdown
  • "Place replies in the folder of the message being replied to" did not work when using "Reply to List"
  • Thunderbird did not honor the "Run search on server" option when searching messages
  • Highlight color for folders with unread messages wasn't visible in dark theme
  • OpenPGP: Key were missing from Key Manager
  • OpenPGP: Option to import keys from clipboard always disabled
  • The "Link" button on the large attachments info bar failed to open up Filelink section in Options if the user had not yet configured Filelink
  • Address book: Printing members of a mailing list resulted in incorrect output
  • Unable to connect to LDAP servers configured with a self-signed SSL certificate
  • Autoconfig via LDAP did not work as expected
  • Calendar: Pressing Ctrl-Enter in the new event dialog would create duplicate events
  • Various security fixes

New in Thunderbird 84.0 Beta 2 (Dec 2, 2020)

  • Changes:
  • MailExtensions: getComposeDetails will wait for "compose-editor-ready" event
  • MailExtensions: Honor allowScriptsToClose argument in windows.create API function
  • Fixes:
  • Highlight color for folders with unread messages wasn't visible in dark theme
  • The "Link" button on the large attachments info bar failed to open up Filelink section in Options if the user had not yet configured Filelink
  • New mail icon was not removed from the system tray at shutdown
  • Address book: Printing members of a mailing list resulted in incorrect output
  • Calendar: Auto-detection failed for GSuite accounts
  • Calendar: Pressing Ctrl-Enter in the new event dialog would create duplicate events
  • Known Issues:
  • Printing from calendar does not work

New in Thunderbird 84.0 Beta (Dec 2, 2020)

  • What’s New:
  • OpenPGP: "Copy Key Id" option added to Key Manager context menu
  • Calendar: Support opening of .ics files by double-click
  • Changes:
  • Thunderbird now only shows quota exceeded indications on the main window
  • MailExtensions: message.compose API extended with EditAsNew and Template functions
  • MailExtensions: menus API enabled in messages being composed
  • Fixes:
  • "Place replies in the folder of the message being replied to" did not work when using "Reply to List"
  • Thunderbird did not honor the "Run search on server" option when searching messages
  • OpenPGP: After importing a secret key, Key Manager displayed properties of the wrong key
  • OpenPGP: Key were missing from Key Manager
  • Print preview was blank
  • Autoconfig via LDAP did not work as expected
  • Various visual improvements
  • fixed
  • MailExtensions: compose.beginForward did not respect composeDetails argument

New in Thunderbird 78.5.0 (Nov 27, 2020)

  • What’s New:
  • OpenPGP: Added option to disable attaching the public key to a signed message
  • MailExtensions: "compose_attachments" context added to Menus API
  • MailExtensions: Menus API now available on displayed messages
  • Changes:
  • MailExtensions: browser.tabs.create will now wait for "mail-delayed-startup-finished"
  • Fixes:
  • OpenPGP: Support for inline PGP messages improved
  • OpenPGP: Message security dialog showed unverified keys as unavailable
  • Chat: New chat contact menu item did not function
  • Various theme and usability improvements
  • Various security fixes

New in Thunderbird 78.4.3 (Nov 18, 2020)

  • Fixes:
  • User interface was inconsistent when switching from the default theme to the dark theme and back to the default theme
  • Email subject would disappear when hovering over it with the mouse when using Windows 7 Classic theme
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.4.2 (Nov 10, 2020)

  • Fixes:
  • Security fix

New in Thunderbird 78.4.1 (Nov 6, 2020)

  • What’s New:
  • Thunderbird prompts for an address to use when starting an email from an address book entry with multiple addresses
  • Fixes:
  • Searching global search results did not work
  • Link location was not focused by default when adding a hyperlink in message composer
  • Advanced address book search dialog was unusable
  • Encrypted draft reply emails lost "Re:" prefix
  • Replying to a newsgroup message did not open the compose window
  • Unable to delete multiple newsgroup messages
  • Appmenu displayed visual glitches
  • Visual glitches when selecting multiple messages in the message pane and using Ctrl+click
  • Switching between dark and light mode could lead to unreadable text on macOS
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.4.0 (Oct 22, 2020)

  • What’s New:
  • MailExtensions: browser.tabs.sendMessage API added
  • MailExtensions: messageDisplayScripts API added
  • Changes:
  • Yahoo and AOL mail users using password authentication will be migrated to OAuth2
  • MailExtensions: messageDisplay APIs extended to support multiple selected messages
  • MailExtensions: compose.begin functions now support creating a message with attachments
  • Fixes:
  • Thunderbird could freeze when updating global search index
  • Multiple issues with handling of self-signed SSL certificates addressed
  • Recipient address fields in compose window could expand to fill all available space
  • Inserting emoji characters in message compose window caused unexpected behavior
  • Button to restore default folder icon color was not keyboard accessible
  • Various keyboard navigation fixes
  • Various color-related theme fixes
  • MailExtensions: Updating attachments with onBeforeSend.addListener() did not work
  • Various security fixes

New in Thunderbird 78.3.2 (Oct 7, 2020)

  • Changes:
  • Thunderbird will no longer automatically install updates when Preferences tab is opened
  • Fixes:
  • OpenPGP: Improved support for encrypting with subkeys
  • OpenPGP: Encrypted messages with international characters were sometimes displayed incorrectly
  • Single-click deletion of recipient pills with middle mouse button restored
  • Searching an address book list did not display results
  • Windows installer was unreadable with Windows in high contrast mode
  • Dark mode, high contrast, and Windows theming fixes
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.3.1 (Sep 27, 2020)

  • Fixes:
  • Thunderbird crashed after updating to 78.3.0

New in Thunderbird 78.3.0 (Sep 27, 2020)

  • Changes:
  • OpenPGP: Improved decryption performance with large messages
  • OpenPGP: Do not show external key UI when disabled by preference
  • Account setup wizard will now open a popup when connecting to a server with a self-signed SSL/TLS certificate
  • Installation of "legacy" MailExtensions now disabled
  • Reply-To header moved in compose window; now appears under From header
  • Calendar: Sidebar UI improvements
  • Fixes:
  • Selecting "Cancel" on the Master Password prompt at startup incorrectly reported corrupted OpenPGP data
  • OpenPGP: Creating a new key pair did not automatically select it for use
  • Dragging & Dropping recipient pills resulted in lost pills when an error was present
  • Spellcheck suggestions were unreadable in dark theme
  • Calendar: Multiple password prompts opened
  • Linux Distributions: UI was not rendered completely when built without updater
  • MailExtensions: browser.folders.delete failed on IMAP folders
  • Various security fixes
  • Known Issues:
  • Message list is not focused at startup

New in Thunderbird 78.2.2 (Sep 11, 2020)

  • What’s New:
  • Drag and Drop reordering of recipient pills now supported
  • Changes:
  • OpenPGP: Some signature states reported as "mismatch" now report "unknown"
  • Privacy policy now displayed in a tab when updated
  • Chat: Non-functional Twitter support removed
  • Fixes:
  • OpenPGP: Improvements to key importing when failures occur
  • OpenPGP: Decryption did not work with certain HTTP proxy configurations
  • OpenPGP: "Discover keys online" option did not work when searching for an email address
  • Email filters reported failure when moving a message to original folder
  • Message filters: Filters shown as enabled in configuration dialog were not always enabled
  • vCard 2.1 attachments not handled properly
  • Sending messages sometimes failed when recipients were in LDAP address book
  • Non-functional help menu items removed
  • Calendar: Event reminder details were unreadable
  • Windows 10 high-contrast theme fixes
  • More theme fixes and improvements
  • MailExtensions: Adding custom headers with mail.compose.other.header did not work
  • Known Issues:
  • Selecting "Cancel" on the Master Password prompt at startup incorrectly reports corrupted OpenPGP data.

New in Thunderbird 78.2.1 (Aug 30, 2020)

  • Changes:
  • OpenPGP enabled by default
  • OpenPGP: Disabled the use of MD5/SM2/SM3 algorithms
  • Fixes:
  • OpenPGP: Users with sub-identities were unable to encrypt or sign messages when switching identities
  • OpenPGP message security window did not support dark mode

New in Thunderbird 78.2.0 (Aug 30, 2020)

  • Changes:
  • OpenPGP Key generation now disabled when there is no default mail account configured
  • OpenPGP: Encrypt saved drafts when OpenPGP is enabled
  • Twitter search removed
  • Calendar: Event summary dialog is now themeable
  • MailExtensions: Some APIs now use defineLazyPreferenceGetter in order to benefit from
  • Fixes:
  • OpenPGP Key Manager search function did not work
  • OpenPGP Key Properties dialog was sometimes too small
  • OpenPGP: Encrypted email would not send if address contained uppercase characters
  • OpenPGP: "Key ID" column could not be resized in Key Manage
  • OpenPGP: Keys containing invalid UTF-8 strings could not be imported
  • OpenPGP: Enable automatic signing for encrypted messages in additional scenarios
  • Many more OpenPGP bug fixes and improvements
  • IMAP fetch chunk size was always 65536 bytes
  • IMAP server capabilities were not rechecked after upgrading to SSL/TLS connection
  • Message Composer: Order of attachments could not be modified using drag & drop
  • Composing messages with a "fixed width" font did not work
  • Drag and drop of address book contacts did not work in some situations
  • Address book migration failed when there was a dot in the file name
  • Address book: "Always prefer display name over message header" was always checked when editing a contact
  • Address book performance optimizations
  • Dialog to add a new mail account from "Account Settings" did not open
  • "Select All" (Ctrl+A) in message source did not work until focused with a mouse click
  • Ctrl+scroll wheel not zooming in message reader
  • Setting/changing a signature from a file lost when closing account settings
  • Adaptive Junk Mail settings could not be disabled
  • Message filter dialog fixes: Missing scrollbar, drop-down list not wide enough
  • Various UX and theme improvements

New in Thunderbird 78.1.1 (Aug 7, 2020)

  • Changes:
  • Building OpenPGP shared library linked to system libraries now supported
  • MailExtension errors now shown in Developer Tools console by default
  • MailExtensions: Dynamic registration of calendar providers now supported
  • Fixes:
  • OpenPGP improvements
  • Message preview was sometimes blank after upgrading from Thunderbird 68
  • Email addresses whitelisted for remote content not displayed in preferences
  • Importing data from Seamonkey did not work
  • Renaming a mail list did not update the side bar
  • MailExtensions: messenger.* namespace was undefined
  • Known Issues:
  • Mail header toolbar (Reply, Forward, Archive, Junk buttons) no longer configurable
  • Fixed width font not working in compose window

New in Thunderbird 78.1.0 (Jul 31, 2020)

  • What’s New:
  • OpenPGP support is now feature complete. Improvements: new Key Wizard, online searching for OpenPGP keys, and more
  • The preferences tab now has a search field
  • Changes:
  • Dark background in message reader is now disabled
  • Fixes:
  • Thunderbird startup was slow when using folder color customizations with many folders. Previously configured colors will not be migrated.
  • Mail quota usage in status bar did not support terabyte folder sizes
  • Changing Junk mail settings with keyboard toggled wrong setting
  • Advanced IMAP server preferences not saved in Account Manager
  • Address book migration updates and fixes
  • Address book: Last Modified Date was not updated
  • Dark mode improvements
  • Various security fixes

New in Thunderbird 78.0.1 (Jul 22, 2020)

  • What’s New:
  • OpenPGP: Key revocation, extending key expiration, and secret key backup
  • Fixes:
  • Drag & Drop multiple attachments to macOS Finder created duplicate files
  • Faceted search date and relevance settings not saved
  • FileLink attachments included as a link and file when added from a network drive via drag & drop
  • About Thunderbird dialog keyboard shortcuts did not work
  • CC'd recipients sometimes displayed collapsed in header pane
  • Incremental search in contacts sidebar did not always display local results when an LDAP server was also in use
  • Contacts sidebar search results cleared after removing a contact
  • OpenPGP: Messages with long Armor Header lines did not display
  • OpenPGP: Messages containing non-UTF-8 text were not supported
  • Various UI and theming fixes
  • Chat: Participants list did not display operator flags

New in Thunderbird 78.0 (Jul 19, 2020)

  • What’s New:
  • New Account Hub for centralized account setup
  • Redesigned recipient address fields (To, Cc, Bcc) as single-line input fields (pills) for multiple addresses instead of one line per address. More improvements to come.
  • Color customization of Folder Pane icons
  • Allow selecting messages via selection boxes instead of classic selection. "Select Messages" column needs to be selected via the thread pane's column picker.
  • "Delete" action column in thread pane (message list). "Select Messages" column needs to be selected via the thread pane's column picker.
  • Themes can be previewed in the Add-On Manager
  • Minimize to tray support added for Windows
  • New config option to anonymize message date header
  • Global Search menu item in app menu
  • Additional Enterprise policies
  • Calendar: Added ICS import support to -file command line option
  • Calendar: Add event preview to ICS import dialog
  • Chat: OTR messaging support
  • Chat: IRC echo-message capability
  • Changes:
  • Add-on support: As of version 78.0, Thunderbird only supports MailExtensions and MailExtension Experiments. Restartless add-ons and non-restartless legacy add-ons using XUL overlays are no longer supported.
  • Linux minimum runtime requirements have changed: GTK 3.14, GLIBC 2.17, libstdc++ 4.8.1 Details
  • Thunderbird Options/Preferences tab redesigned and with new user interface
  • Account creation dialog redesigned and with new user interface
  • Account Manager moved to a tab
  • Add-ons manager with new user interface and notifications
  • Improved "Recent" folder list for "Move to" and "Copy to" in message context menu
  • Improved UI of global search results tab
  • Improvements to the location bar of a tab displaying web pages
  • Use scalable icons throughout Thunderbird to improve support for HiDPI monitors and dark mode
  • Thunderbird will now ask for OS account password before displaying saved passwords
  • Address books are now stored as SQLite databases to prepare for future addressbook improvements. Existing address books in MAB format (using a Mork database) will be converted.
  • New parser and formatter for vCard. vCard versions 3.0 and 4.0 are now supported.
  • Various theme and dark mode improvements
  • Various look and feel improvements
  • Improved dialog for folder compaction (purging of deleted messages)
  • Graphics hardware acceleration is now enabled by default
  • TLS 1.0 and 1.1 disabled
  • Calendar: The Lightning calendar add-on is now integrated into Thunderbird
  • Calendar: Lightning version removed from Thunderbird user agent string
  • Calendar: Web Calendar Access Protocol (WCAP) support removed
  • Calendar: Storage access is now asynchronous to improve performance
  • Calendar: Location URLs are now clickable
  • Addon Developers: Updates to and expansion of MailExtensions APIs. Details
  • Fixes:
  • Password display font had characters that were difficult to read
  • When copying messages from an IMAP folder to a local folder, offline store wasn't used
  • While Thunderbird was in safe mode, the help menu did not offer an item to restart with add-ons enabled
  • Mailbox quotas not displayed correctly
  • Images not rotated when composing a message
  • Email addresses sometimes displayed incorrectly in message composer
  • Many accessibility fixes and improvements: message composer, account setup, attachment pane
  • Mailbox format conversion fixes
  • Address book improvements: exporting, editing contacts, contact photos
  • Chat: Renaming contacts in context menu did not work
  • Calendar: Task and event dialogs were sometimes too small for their content
  • Calendar: URLs in the event reminder dialog were not clickable
  • Various security fixes
  • Known Issues:
  • Mail header toolbar (Reply, Forward, Archive, Junk buttons) no longer configurable
  • Preferences search not available
  • Drag and drop of address book contacts not working in some situations

New in Thunderbird 68.10.0 (Jul 2, 2020)

  • Fixes:
  • Chat: Topics displayed some characters improperly
  • Calendar: Filtering tasks did not work when "Incomplete Tasks" was selected

New in Thunderbird 68.9.0 (Jun 5, 2020)

  • Fixes:
  • Custom headers added for searching or filtering could not be removed
  • Calendar: Today Pane updated prior to loading all data
  • Stability improvements
  • Various security fixes

New in Thunderbird 68.8.1 (May 24, 2020)

  • Fixes:
  • IMAP stability improvements
  • HTML tags in IRC topic changes were rendered incorrectly
  • MailExtensions: Websockets could not be used

New in Thunderbird 68.8.0 (May 11, 2020)

  • Fixes:
  • Account Manager: text fields were too small in some cases
  • Account Manager: Authentication method did not update when selecting an SMTP server
  • Links with embedded credentials did not open on Windows
  • Messages were sometimes sent with a badly formed address when filled from the address book
  • Accessibility: Screen readers were reporting too many activities from the status bar
  • MailExtensions: Setting IMAP messages as read with browser.messages.updated failed to persist
  • Various security fixes

New in Thunderbird 68.7.0 (May 5, 2020)

  • What’s New:
  • MailExtensions: Raw message source available to MailExtensions
  • Changes:
  • MailExtensions: messages.update function extended to mark messages as junk or not junk
  • MailExtensions: browser.compose.begin functions no longer expand mailing lists
  • Fixes:
  • Various improvements to account setup when connecting to an Exchange server
  • Thread collapsed when opening news message in a new window
  • Addons not automatically updated to compatible version after upgrade from Thunderbird 60
  • Updating addons did not prompt when requesting new permissions
  • Extra recipients panel not keyboard-accessible
  • Accessibility: Status bar was not detected by screenreaders
  • MailExtensions: messages.query by folder name did not require accountsRead permission
  • Calendar: Invitations with embedded null bytes did not always decode correctly
  • Calendar: Cancelled events didn't show with a line-through
  • Various security fixes

New in Thunderbird 68.6.0 (Mar 13, 2020)

  • What’s New:
  • Thunderbird now displays a popup window when starting up on a new profile
  • Changes:
  • Thunderbird now provides partial updates resulting in smaller downloads
  • Fixes:
  • Searching in message bodies led to false negatives under some circumstances in quoted-printable encoded HTML bodies
  • "Get New Messages for All Accounts" not working for OAuth2-authenticated IMAP accounts
  • Various security fixes

New in Thunderbird 68.5.0 (Feb 12, 2020)

  • What’s New:
  • Support for Client Identity IMAP/SMTP Service Extension
  • Support for OAuth 2.0 authentication for POP3 accounts
  • Fixes:
  • Status area goes blank during account setup
  • Calendar: Could not remove color for default categories
  • Calendar: Prevent calendar component loading multiple times
  • Calendar: Today pane did not retain width between sessions
  • Various security fixes

New in Thunderbird 68.4.2 (Jan 25, 2020)

  • Changes:
  • Calendar: Task and Event tree colours adjusted for the dark theme
  • Fixes:
  • Retrieval of S/MIME certificates from LDAP failed
  • Address-parsing crash on some IMAP servers when preference mail.imap.use_envelope_cmd was set
  • Incorrect forwarding of HTML messages caused SMTP servers to respond with a timeout
  • Calendar: Various parts of the calendar UI stopped working when a second Thunderbird window opened
  • Various security fixes

New in Thunderbird 68.4.1 (Jan 10, 2020)

  • Changes:
  • Various improvements when setting up an account for a Microsoft Exchange server: Now offers IMAP/SMTP if available, better detection for Office 365 accounts; re-run configuration after password change.
  • Fixes:
  • After changing view layout, the message display pane showed garbled content under some circumstances
  • Various security fixes
  • Various theme changes to achieve "pixel perfection": Unread icon, "no results" icon, paragraph format and font selector, background of folder summary tooltip
  • Tags were lost on messages in shared IMAP folders under some circumstances
  • Calendar: Event attendee dialog was not displayed correctly

New in Thunderbird 68.3.1 (Dec 17, 2019)

  • Changed:
  • In dark theme unread messages no longer shown in blue to distinguish from tagged messages
  • Account setup is now using client side DNS MX lookup instead of relying on a server.
  • Fixed:
  • Searching LDAP address book crashed in some circumstances
  • Message navigation with backward and forward buttons did not work in some circumstances
  • WebExtension toolbar icons were displayed too small
  • Calendar: Tasks due today were not listed in bold
  • Calendar: Last day of long-running events was not shown

New in Thunderbird 68.3.0 (Dec 4, 2019)

  • NEW:
  • Message display toolbar action WebExtension API
  • Navigation buttons are now available in content tabs, for example those opened via an add-on search
  • CHANGED:
  • "New email" icon in Windows systray changed from in-tray with arrow to envelope
  • FIXED:
  • Icons of attachments in the attachment pane of the Write window not always correct
  • Toolbar buttons of add-ons in the menubar not shown after startup
  • LDAP lookup not working when SSL was enabled. LDAP search not working when "All Address Books" was selected.
  • Scam link confirmation panel not working
  • In Write window, the Link Properties dialog wasn't showing named anchors in context menu
  • Calendar: Start-up failed if the application menu is not on the calendar toolbars
  • Chat: Account reordering via drag-and-drop not working on Instant messaging status dialog (Show Accounts)
  • Known Issues:
  • UNRESOLVED:
  • When upgrading from Thunderbird version 60 to version 68, add-ons are not automatically updated during the upgrade process. They will however be updated during the add-on update check. It is of course possible to reinstall combatible add-on via the Add-ons Manager or via addons.thunderbird.net.

New in Thunderbird 68.2.2 (Nov 7, 2019)

  • What’s New:
  • fixed:
  • Then upgrading a 64bit version of Thunderbird version 60 to version 68, the existing profile wasn't recognized and a new profile was created.
  • Note: If your profile is still not recognized, select it by visiting about:profiles in the Troubleshooting Information.
  • Known Issues:
  • When upgrading from Thunderbird version 60 to version 68, add-ons are not automatically updated during the upgrade process. They will however be updated during the add-on update check. It is of course possible to reinstall combatible add-on via the Add-ons Manager or via addons.thunderbird.net.
  • LDAP lookup not working when SSL is enabled. Workaround: Disable SSL or switch off option "Query OSCP responder servers" in the certificate settings in advanced options.

New in Thunderbird 68.2.1 (Nov 1, 2019)

  • New:
  • A language for the user interface can now be chosen in the advanced settings (multilingual UI)
  • Fixed:
  • Problem with Google authentication (OAuth2)
  • Selected or unread messages not shown in the correct color in the thread pane (message list) under some circumstances
  • When using a language pack, names of standard folders weren't localized
  • Address book default startup directory in preferences panel not persisted
  • Various visual glitches: Conditions in filter editor not high enough, folder location widget not showing folder name, problem with menubar customization, add-on home page links accumulating, theme issues on Windows 7
  • Chat: Extended context menu on Instant messaging status dialog (Show Accounts)

New in Thunderbird 68.2.0 (Oct 24, 2019)

  • New:
  • Message Display WebExtension API
  • Message Search WebExtension API
  • Fixed:
  • Better visual feedback for unread messages when using the dark theme
  • Various issues when editing mailing lists
  • Integration with macOS addressbook and notifications not working after introduction of notarization
  • Application windows not maintaining their size after restart
  • Issues when upgrading from a 32bit version of Thunderbird to a 64bit version. Note: If your profile is still not recognised, selected it by visiting about:profiles in the Troubleshooting Information.

New in Thunderbird 68.1.2 (Oct 14, 2019)

  • Fixed:
  • Visual glitches: Missing context menu in filter, downloads, password manager and Config Editor search boxes, unwanted scrollbars and cut-off text in Account Manager, incorrect colors in Calendar agenda scrollbars, theme issues on Windows 7
  • Some attachments couldn't be opened in messages originating from MS Outlook 2016
  • Address book import form CSV
  • Performance problem in message body search
  • Ctrl+Enter to send a message would open an attachment if the attachment pane had focus
  • Calendar: Issues with "Today Pane" start-up
  • Calendar: Glitches with custom repeat and reminder number input
  • Calendar: Problems with WCAP provider

New in Thunderbird 70.0 Beta 1 (Sep 12, 2019)

  • New:
  • Allow selecting messages via selection boxes instead of classic selection. "Select Messages" column needs to be selected via the thread pane's column picker.
  • Message Display MailExtensions API with documentation here
  • Changed:
  • Thunderbird Options/Preferences tab redesigned and with new user interface
  • Account creation dialog redesigned and with new user interface
  • Dialog for folder compaction (purging of deleted messages)
  • Thread pane column pickers stays open for selecting multiple columns until user clicks outside or hits escape
  • Add-ons manager with new user interface and notifications. Note that manual installation of add-ons via drag-and-drop currently doesn't work.
  • Fixed:
  • Gmail accounts ignored a non-standard trash folder selection. Note: If non-standard trash folder was selected previously in the account settings, this setting will now take effect which may be unexpected.
  • Edit tag not working
  • Write window: "Insert > Characters and Symbols" not working
  • Moving/dragging messages from "Search Messages" result dialog not working
  • Command line -compose "attachment=" not working
  • Custom views not working
  • Issues with list of content types/actions for incoming attachments
  • Clicking mailto links in browser doesn't open Thunderbird Write window
  • "Learn More" links in Error Console not working
  • Visual glitches: Quick Filter Bar tag buttons too tall, missing scroll bar on Connection Setting subdialog, LDAP server selection after "New", "Edit" and "Delete"
  • Calendar: Parts of CalDAV dialog not working
  • Calendar: Free/busy information in attendees dialog not loaded

New in Thunderbird 68.1.0 (Sep 12, 2019)

  • New:
  • Offer to configure Exchange accounts for Office365. A third-party add-on is required for this account type. IMAP still exists as alternative.
  • Fixed:
  • Edit tag not working
  • Write window: "Insert > Characters and Symbols" not working
  • Moving/dragging messages from "Search Messages" result dialog not working
  • Command line -compose "attachment=" not working
  • Custom views not working
  • Issues with list of content types/actions for incoming attachments
  • "Learn More" links in Error Console not working
  • Visual glitches: Quick Filter Bar tag buttons too tall, missing scroll bar on Connection Setting subdialog, LDAP server selection after "New", "Edit" and "Delete"
  • Calendar: Parts of CalDAV dialog not working

New in Thunderbird 68.0 (Aug 30, 2019)

  • New:
  • File link attachments can now be linked to again instead of uploading them again
  • Mark all folders of an account as read
  • Run filters periodically. Improved filter logging.
  • OAuth2 authentication for Yandex
  • Language packs can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false)
  • On Windows a 64bit installer and MSI package are now available, see the Thunderbird for Organisations page for details
  • Added a policy engine that allows customized Thunderbird deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file
  • TCP keepalive for IMAP protocol
  • Full Unicode support for MAPI interfaces: New support for MAPISendMailW
  • To protect your profile data against a downgrade, Thunderbird 68 may display a message "You have launched an older version of Thunderbird" and will not allow opening a specific profile. Workaround: start with option --allow-downgrade. See this support article for details.
  • Calendar: Time zone data can now include past and future changes. All known time zone changes from 2018 to 2022 are included.
  • Chat: In each conversation an individual spellcheck language can be selected now
  • changed
  • Add-on support: Add-ons are only supported if add-on authors have adapted them
  • changed
  • Dictionary support: Only WebExtension dictionaries are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension dictionaries.
  • Changed:
  • Theme support: Only WebExtension themes are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension themes.
  • The stand-alone options window has been removed, all options are now shown in a tab
  • Changed UI when installing add-ons
  • Various theme improvements including a dark message list/thread pane
  • Application menu aka "Hamburger menu"
  • Improvements when entering, selecting and removing recipients in the Write window
  • FileLink: WeTransfer is already included. Dropbox and Box.com using the new WebExtensions FileLink API are available as add-ons, amongst others.
  • Text and background colors in the Write window and custom colors for tags are no longer restricted to a fixed 10x7 matrix of HTML colors
  • Composition text and background colors no longer sent by default. New option in "Tools > Options, Composition".
  • UI improvements for external and detached attachments, now showing as links with new menu option "Open Containing Folder"
  • Improved phishing attempt detection for messages with certain forms
  • Improvements to scam warnings
  • Reply to self will now search all identities (default of preference mailnews.reply_to_self_check_all_ident changed to true)
  • Maildir now uses the message ID as file name and "eml" as file extension
  • Auto-compact threshold increased from 20 MB to 200 MB
  • Calendar: UI improvements for event dialog
  • Calendar: Thunderbird's calendar add-on Lightning now uses the same version numbering scheme
  • Fixed:
  • Column choice and sort order in "Search Messages" dialog lost after relaunch
  • Global indexer causing high CPU loads under some circumstances
  • Tags set on IMAP folders sometimes not visible to other users
  • "Contribute" button in add-on details not working
  • SMTP password wasn't removed when account was deleted or server or user name were changed
  • Mbox to Maildir conversion not working if Windows search integration is enabled
  • Mails won't get removed from Trash folder using Maildir. Note: Other deletion issues related to Maildir may still persist.
  • When sending of a message failed due a security issue, only "unknown error" was displayed. Now more details are given.
  • Improvements of SMTP 5.7.1 message
  • Calendar: Multiple connections with different users to the same CalDAV server not working
  • Chat: Fixed XMPP authentication when using SASL

New in Thunderbird 60.8.0 (Jul 11, 2019)

  • Changed:
  • Calendar: Problems when editing event times, some related to AM/PM setting in non-English locales

New in Thunderbird 60.7.2 (Jun 21, 2019)

  • Fixed:
  • Various security fixes

New in Thunderbird 60.7.1 (Jun 17, 2019)

  • Fixed:
  • No prompt for smartcard PIN when S/MIME signing is used
  • Various security fixes:
  • CVE-2019-11704: Heap buffer overflow in icalvalue.c:
  • A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in icalmemory_strdup_and_dequote when processing certain email messages, resulting in a potentially exploitable crash.
  • CVE-2019-11704: Heap buffer overflow in icalvalue.c:
  • A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in icalmemory_strdup_and_dequote when processing certain email messages, resulting in a potentially exploitable crash.
  • CVE-2019-11706: Type confusion in icalproperty.c:
  • A flaw in Thunderbird's implementation of iCal causes a type confusion in icaltimezone_get_vtimezone_properties when processing certain email messages, resulting in a crash.

New in Thunderbird 60.6.1 (Mar 26, 2019)

  • FIXED:
  • Various security fixes

New in Thunderbird 60.6.0 (Mar 20, 2019)

  • Fixed:
  • Calendar: Can't create repeating event with end date when using certain time zones, for example Europe/Minsk

New in Thunderbird 60.5.3 (Mar 6, 2019)

  • Fixed:
  • Problem when using "Send to > Mail recipient" on Windows introduced in version 60.5.2

New in Thunderbird 60.5.1 (Feb 15, 2019)

  • Fixed:
  • CalDav access to some servers not working
  • Various security fixes

New in Thunderbird 60.5.0 (Jan 30, 2019)

  • What’s New:
  • new
  • FileLink provider WeTransfer to upload large attachments
  • new
  • Thunderbird now allows the addition of OpenSearch search engines from a local XML file using a minimal user inferface: [+] button to select a file an add, [-] to remove.
  • new
  • More search engines: Google and DuckDuckGo available by default in some locales
  • new
  • During account creation, Thunderbird will now detect servers using the Microsoft Exchange protocol. It will offer the installation of a 3rd party add-on (Owl) which supports that protocol.
  • fixed
  • Thunderbird now compatible with other WebExtension-based FileLink add-ons like the Dropbox add-on
  • fixed
  • Crash when using custom sound for new email notification
  • fixed
  • Various security fixes

New in Thunderbird 60.4.0 (Dec 21, 2018)

  • New:
  • WebExtensions FileLink API to facilitate FileLink add-ons for WeTransfer and Dropbox (forthcoming)
  • Fixed:
  • Decoding problems for messages with less common charsets (cp932, cp936)
  • New messages in the drafts folder (and other special or virtual folders) will no longer be included in the new messages notification

New in Thunderbird 60.3.3 (Dec 6, 2018)

  • Fixed:
  • Under some circumstances Thunderbird on Mac will send attachments using the so-called AppleDouble format which can lead to problems with mail servers and recipients
  • Encoding problems when exporting address books or messages using the system charset. Messages are now always exported using the UTF-8 encoding.
  • If the "Date" header of a message was invalid, Jan 1970 or Dec 1969 was displayed. Now using date from "Received" header instead.
  • Body search/filtering didn't reliably ignore content of tags
  • Inappropriate warning "Thunderbird prevented the site (addons.thunderbird.net) from asking you to install software on your computer" when installing add-ons
  • Incorrect display of correspondents column since own email address was not always detected
  • Spurious (encoded newline) inserted into drafts and sent email
  • New email not inserted in correct sort order in threaded unified view or search folder

New in Thunderbird 60.3.2 (Dec 2, 2018)

  • Fixed:
  • Under some circumstances Thunderbird on Mac will send attachments using the so-called AppleDouble format which can lead to problems with mail servers and recipients
  • Encoding problems when exporting address books or messages using the system charset. Messages are now always exported using the UTF-8 encoding.
  • If the "Date" header of a message was invalid, Jan 1970 or Dec 1969 was displayed. Now using date from "Received" header instead.
  • Body search/filtering didn't reliably ignore content of tags
  • Inappropriate warning "Thunderbird prevented the site (addons.thunderbird.net) from asking you to install software on your computer" when installing add-ons
  • Incorrect display of correspondents column since own email address was not always detected
  • Spurious (encoded newline) inserted into drafts and sent email
  • New email not inserted in correct sort order in threaded unified view or search folder

New in Thunderbird 60.3.1 (Nov 20, 2018)

  • Fixed:
  • Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog
  • Cookie removal (not working since Thunderbird version 52)
  • "Download rest of message" not working if global inbox was used
  • Encoding problems for users (especially in Poland) when a file was sent via a folder using "Sent to > Mail recipient" due to a problem in the Thunderbird MAPI interface
  • According to RFC 4616 and RFC 5721, passwords containing non-ASCII characters are encoded using UTF-8 which can lead to problems with non-compliant providers, for example office365.com. The SMTP LOGIN and POP3 USER/PASS authentication methods are now using a Latin-1 encoding again to work around this issue.
  • Shutdown crash/hang after entering an empty IMAP password

New in Thunderbird 60.3.0 (Nov 1, 2018)

  • Fixed:
  • Various Theme fixes where incorrect colors, backgrounds, etc. were displayed
  • Add-on Options menu not working on Mac
  • Shift+PageUp/PageDown in Write window
  • Saving content of Write windows didn't overwrite existing file
  • Issues related to "Edit Template" command
  • Gloda attachment filtering
  • Mailing list address auto-complete enter/return handling
  • Thunderbird hung if HTML signature references non-existent image
  • Filters not working for headers that appear more than once

New in Thunderbird 60.2.1 (Oct 3, 2018)

  • Changed:
  • Calendar: Default values for the first day of the week and working days are now derived from the selected datetime formatting locale (restart after changing locale in the OS required)
  • Calendar: Switch to a Photon-style icon set for all platforms
  • Fixed:
  • Multiple requests for master password when Google Mail or Calendar OAuth2 is enabled
  • Scrollbar of the address entry auto-complete popup does not work
  • Security info dialog in compose window does not show certificate status
  • Links in the Add-on Manager's search results and theme browsing tabs open in external browser
  • Localized versions of Thunderbird didn't show a localized name for the "Drafts" and "Sent" folders for certain IMAP providers (particularly in France)
  • Replying to a message with an empty subject inserted Re: twice (not working in Thunderbird 60.0)
  • Spellcheck marks disappeared erroneously for words with an apostrophe (not working in Thunderbird 60.0)
  • Calendar: First day of the week cannot be set
  • Calendar: Several fixes related to cutting/deleting of events and email scheduling

New in Thunderbird 60.0 (Aug 6, 2018)

  • NEW: When writing a message, a delete button now allows the removal of a recipient. This delete button is displayed when hovering the To/Cc/Bcc selector.
  • NEW: Many improvements to attachments handling during compose: Attachments can now be reordered using a dialog, keyboard shortcuts, or drag and drop. The "Attach" button moved to the right to be above the attachment pane. The access key of the attachment pane (e.g. Alt+M, may vary depending on localization, Ctrl+M on Mac) now also works to show or hide the pane. The attachment pane can also be shown initially when composing aNEW message. Right-click on the header to enable this option. Hiding a non-empty attachment pane will now show a placeholder paperclip to indicate the presence of attachments and avoid sending them accidentally.
  • NEW: "Edit Template" command. This also solves various problems when saving as template (duplicates created, message ID lost).
  • NEW: "New Message from Template" command
  • NEW: Allow changing the Spellcheck Language from status bar
  • NEW: Light and Dark themes
  • NEW: WebExtension themes are now enabled in Thunderbird
  • NEW: A default startup directory in the address book window can now be configured
  • NEW: Individual feed update interval
  • NEW: An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.
  • NEW: OAuth2 authentication for Yahoo and AOL
  • NEW: FIDO U2F support
  • NEW: Thunderbird now allows the conversion of folders from mbox to maildir format and vice versa. This is an experimental feature that needs to be enabled by setting the preference mail.store_conversion_enabled. Note that this functionality does not not work if the option "Allow Windows Search/Spotlight to search messages" is selected.
  • NEW: Calendar: Allow copying, cutting or deleting of a selected occurrence or the entire series for recurring events
  • NEW: Calendar: Provide an option to display locations for events in calendar day and week views
  • NEW: Calendar: Provide the ability for sending/not sending meeting notifications directly instead of showing a popup
  • NEW: Calendar: Option to select the target calendar when pasting an event or task
  • NEW: Calendar: Allow email scheduling for CalDAV servers supporting server-side scheduling
  • NEW: Thunderbird Chat now contains multiple built-in message themes
  • CHANGED: IMPORTANT: Add-ons not marked as compatible with Thunderbird 60 by their authors will be disabled (this can be reverted via preference extensions.strictCompatibility)
  • CHANGED: IMAP: When after sending a message storing that sent message fails, the message can now be stored in a local folder
  • CHANGED: Add-on options can no longer be configured from the Add-on Manager page. ANEW menu item "Add-on Options" is now available on the Tools menu.
  • CHANGED: When messages are composed in paragraph format, "body text" and split mail quotes are converted to paragraphs when pressing the enter key
  • CHANGED: "Edit AsNEW Message" will now use the account's default compose format, either HTML or plain text ignoring the format of the message. Plain text messages will be converted to HTML and vice versa. Then using the modifier, the format choice will be reverted.
  • CHANGED: The "Edit Draft" command now also honors the use of the shift key to convert HTML to plain text or vice versa when editing a draft
  • CHANGED: The plain text to HTML conversion has been improved where such a conversion is necessary for "Edit AsNEW Message" or when the shift modifier is used for "Edit Draft" or "New Message from Template".
  • CHANGED: During address entry, the matching part of the address is now shown in bold. Preference mail.autoComplete.commentColumn allows to display the address book where the address is stored.
  • CHANGED: When attaching a message via drag and drop, the subject of the message is now used as attachment name instead of "Attached Message"
  • CHANGED: Better address book photo handling: Photos can be added by drag and drop and a copy of all photos will be stored in the Thunderbird profile
  • CHANGED: On first start, Thunderbird now shows the account setup dialog, no longer the account provisioner dialog
  • CHANGED: Thunderbird follows Firefox' Photon design with rectangular tabs and many other theme improvements
  • CHANGED: When customizing the From: address, Thunderbird will now use this address for the SMTP "MAIL FROM" command. Previously the address configured in the identity was used. The preference mail.smtp.useSenderForSmtpMailFrom allows return to the previous behavior.
  • CHANGED: Native notifications on Linux are now re-enabled
  • CHANGED: Thunderbird now uses Mozilla's latest proxy technology (add-on FoxyProxy now supported)
  • CHANGED: Thunderbird now uses the latest Rust-based Mozilla technology, including Quantum's CSS engine (based on Servo) and encoding_rs, for displaying and encoding messages
  • CHANGED: Calendar: Removal of capability to send email invitations compatible to Outlook 2002 and earlier
  • CHANGED: Calendar: Reminders on read-only calendars can now be dismissed, while reminders for missed events will now only be displayed for writable calendars if option "Show missed reminders for writable calendars" is selected
  • CHANGED: Thunderbird Chat: Nicknames inside of messages are colored to match the participants list
  • FIXED: When many Thunderbird clients or other email clients accessed the same IMAP draft folder, messages were sometimes sent with the wrong identity. This has been corrected and the user will be notified if none of their identities matches the draft.
  • FIXED: Various problems related to handling the IMAP trash folder: Under certain circumstances the selection of the trash folder didn't persist, for example when the name contained non-ASCII characters, or in localized versions of Thunderbird. At times unwanted additional trash folders were created. Selection of a trash folder didn't give immediate visual feedback.
  • FIXED: Shared IMAP folders not shown in subscribe dialog under some circumstances
  • FIXED: Messages moved between IMAP accounts were missing parts (embedded content or attachments) under some circumstances
  • FIXED: Improvements encoding/decoding message headers
  • FIXED: Text in the address book card view wasn't selectable
  • FIXED: Passwords can now contain non-ASCII characters, like international characters, for example áäß, and symbols, for example €§
  • FIXED: Outlook import. Note: Mail, address book and settings need to be imported individually as "Import Everything" currently does not work.
  • FIXED: Localised versions of Thunderbird didn't show a localised name for Hotmail's "Deleted" folder
  • FIXED: Contacts sidebar: Selection and context menu behavior
  • FIXED: Better error handling for Gmail authentication to avoid re-downloading of folders
  • FIXED: Thunderbird used a stale cached password after user edited a saved password
  • FIXED: Calendar: Wrong time formatting for some time zones
  • FIXED: Calendar: Can't copy information from event dialog for received invitations

New in Thunderbird 60.0 RC 1 (Jul 16, 2018)

  • NEW: When writing a message, a delete button now allows the removal of a recipient. This delete button is displayed when hovering the To/Cc/Bcc selector.
  • NEW: Further improvements to attachments handling during compose: "Attach" button moved to the right to be above the attachment pane. Alt+M now allows to show the attachment pane. The attachment pane can also be shown initially when composing a new message. Right-click on the header to enable this option. It is now also impossible to completely collapse a non-empty attachment pane. That protects against attachments accidentally being sent.
  • NEW: Thunderbird now allows the conversion of folders from mbox to maildir format and vice versa. This is an experimental feature that needs to be enabled by setting the preference mail.store_conversion_enabled. Note that this functionality does not not work if the option "Allow Windows Search/Spotlight to search messages" is selected.
  • NEW: Light and Dark themes
  • NEW: WebExtension themes are now enabled in Thunderbird
  • NEW: FIDO U2F support
  • NEW: Calendar: Allow copying, cutting or deleting of a selected occurrence or the entire series for recurring events
  • NEW: Calendar: Provide an option to display locations for events in calendar day and week views
  • NEW: Calendar: Provide the ability for sending/not sending meeting notifications directly instead of showing a popup
  • CHANGED: IMPORTANT: Add-ons not marked as compatible with Thunderbird 60 by their authors will be disabled (this can be reverted via preference extensions.strictCompatibility)
  • CHANGED: Thunderbird will now prompt to compact IMAP folders even if the account is online. Note: Under certain circumstances an incorrect estimate of the expected gain is shown.
  • CHANGED: Better address book photo handling: Photos can be added by drag and drop and a copy of all photos will be stored in the Thunderbird profile
  • CHANGED: Native notifications on Linux are now re-enabled
  • CHANGED: During address entry, the matching part of the address is now shown in bold. Preference mail.autoComplete.commentColumn allows to display the address book where the address is stored.
  • CHANGED: Calendar: Removal of capability to send email invitations compatible to Outlook 2002 and earlier
  • FIXED: Various problems when forwarding messages inline: Some introduced in Thunderbird 60 beta 7, some dating back to 2005 when using "simple" HTML view.
  • FIXED: The IMAP and News subscribe dialog did not present a folder tree (not working since Thunderbird version 59)
  • FIXED: Messages moved between IMAP accounts were missing parts (embedded content or attachments) under some circumstances
  • FIXED: Better error handling for Gmail authentication to avoid re-downloading of folders
  • FIXED: Text in the address book card view wasn't selectable
  • FIXED: UTF-7 support (not working since Thunderbird version 56)
  • FIXED: Complete fix of the EFAIL vulnerability: 1) Removing some HTML crafted to carry out an attack. 2) Not decrypting subordinate message parts that otherwise might reveal decrypted content to the attacker. Preference mailnews.p7m_subparts_external controls this.
  • FIXED: Thunderbird used a stale cached password after user edited a saved password
  • FIXED: The new menu item "Add-on Options" introduced in Thunderbird 59 beta is now also working on Mac
  • FIXED: Source view not working for JS, XML, CSS, etc. source files via 'Developer Tools > Error Console'. Other options: 1) Set preference view_source.editor.external and view_source.editor.path to view the source in the editor of your choice. 2) Use 'Developer Tools > Developer Toolbox, Console'. (not working in earlier versions of Thunderbird 60 beta)
  • FIXED: Deleting or detaching attachments corrupted messages under certain circumstances (not working in earlier versions of Thunderbird 60 beta)
  • FIXED: Calendar: Google account credentials not retained by Lightning
  • KNOWN ISSUES:
  • UNRESOLVED:Provider for Google Calendar not available
  • UNRESOLVED:CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.

New in Thunderbird 52.9.1 (Jul 10, 2018)

  • Changed:
  • Thunderbird will now prompt to compact IMAP folders even if the account is online
  • Fixed:
  • Complete fix of the EFAIL vulnerability: 1) Removing some HTML crafted to carry out an attack. 2) Optionally: Not decrypting subordinate message parts that otherwise might reveal decrypted content to the attacker. Preference mailnews.p7m_subparts_external needs to be set to true for added security.
  • Various problems when forwarding messages inline when using "simple" HTML view
  • Deleting or detaching attachments corrupted messages under certain circumstances (not working only in Thunderbird version 52.9.0)

New in Thunderbird 52.9.0 (Jul 4, 2018)

  • Changed:
  • Thunderbird will now prompt to compact IMAP folders even if the account is online
  • Fixed:
  • Complete fix of the EFAIL vulnerability: 1) Removing some HTML crafted to carry out an attack. 2) Optionally: Not decrypting subordinate message parts that otherwise might reveal decryted content to the attacker. Preference mailnews.p7m_subparts_external needs to be set to true for added security.
  • Various problems when forwarding messages inline when using "simple" HTML view
  • Various security fixes:
  • CVE-2018-12359: Buffer overflow using computed size of canvas element
  • CVE-2018-12360: Use-after-free when using focus()
  • CVE-2018-12372: S/MIME and PGP decryption oracles can be built with HTML emails
  • CVE-2018-12373: S/MIME plaintext can be leaked through HTML reply/forward
  • CVE-2018-12362: Integer overflow in SSSE3 scaler
  • CVE-2018-12363: Use-after-free when appending DOM nodes
  • CVE-2018-12364: CSRF attacks through 307 redirects and NPAPI plugins
  • CVE-2018-12365: Compromised IPC child process can list local filenames
  • CVE-2018-12366: Invalid data handling during QCMS transformations
  • CVE-2018-12368: No warning when opening executable SettingContent-ms files
  • CVE-2018-12374: Using form to exfiltrate encrypted mail part by pressing enter in form field
  • CVE-2018-5188: Memory safety bugs fixed in Firefox 60, Firefox ESR 60.1, Firefox ESR 52.9, and Thunderbird 52.9

New in Thunderbird 52.8.0 (May 19, 2018)

  • Various security fixes:
  • #CVE-2018-5183: Backport critical security fixes in Skia
  • #CVE-2018-5184: Full plaintext recovery in S/MIME via chosen-ciphertext attack
  • #CVE-2018-5154: Use-after-free with SVG animations and clip paths
  • #CVE-2018-5155: Use-after-free with SVG animations and text paths
  • #CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
  • #CVE-2018-5161: Hang via malformed headers
  • #CVE-2018-5162: Encrypted mail leaks plaintext through src attribute
  • #CVE-2018-5170: Filename spoofing for external attachments
  • #CVE-2018-5168: Lightweight themes can be installed without user interaction
  • #CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion through legacy extension
  • #CVE-2018-5185: Leaking plaintext through HTML forms
  • #CVE-2018-5150: Memory safety bugs fixed in Firefox 60, Firefox ESR 52.8, and Thunderbird 52.8

New in Thunderbird 60.0b2 Beta (Apr 5, 2018)

  • Bug 1447263 - Snap: Split build and upload task
  • bug 1443336 - set snap to treeherder tier 2.
  • Bug 1447263 - Snap: Split build and upload task
  • Bug 1425197 - Add additional checks of the target URL in the inspectedWindow devtools actor.
  • Bug 1446445 - app.normandy.first_run should default to true
  • Bug 1346535 - atk: Introduce U+FEFF characters to match AT-SPI offsets with DOM offsets.
  • Bug 1444547 - Propagate proper error codes from u2f-hid-rs to WebAuthn
  • Bug 1397757 Add Learn More link for the Canvas Permission Prompt
  • Bug 1449042: Negotiate tracks even when they're not active.
  • Bug 1414693 - Fix findbar buttons hover feedback when using a dark lightweight theme.

New in Thunderbird 59.0b2 Beta (Mar 1, 2018)

  • New:
  • Further improvements to reordering attachments (introduced in Thunderbird 58 beta), including reordering by drag & drop
  • Edit Template command. This also solves various problems when saving as template (duplicates created, message ID lost).
  • Calendar: Option to select the target calendar when pasting an event or task
  • Changed:
  • Add-on options can no longer be configured from the Add-on Manager page. A new menu item "Add-on Options" is now available on the Tools menu.
  • When customizing the From: address, Thunderbird will now use this address for the SMTP "MAIL FROM" command. Previously the address configured in the identity was used. The preference mail.smtp.useSenderForSmtpMailFrom allows return to the previous behavior.
  • Various updates to the Thunderbird theme. Thunderbird now uses Photon Icons.
  • Calendar: Reminders on read-only calendars can now be dismissed, while reminders for missed events will now only be displayed for writable calendars if option "Show missed reminders for writable calendars" is selected
  • Fixed:
  • Various problems related to handling the IMAP trash folder: Under certain circumstances the selection of the trash folder didn't persist, for example when the name contained non-ASCII characters, or in localized versions of Thunderbird. At times unwanted additional trash folders were created. Selection of a trash folder didn't give immediate visual feedback.
  • Searching message bodies of messages in local folders, including filter and quick filter operations, did not find content in message attachments
  • Shared IMAP folders not shown in subscribe dialog under some circumstances
  • Calendar: Wrong time formatting for some time zones
  • Known Issues:
  • The IMAP and News subscribe dialogue now presents a flat list of folders instead of a folder tree. This will be restored to its original form in the next release.

New in Thunderbird 52.6.0 (Jan 26, 2018)

  • Fixed:
  • Searching message bodies of messages in local folders, including filter and quick filter operations, not working reliably: Content not found in base64-encode message parts, non-ASCII text not found and false positives found.
  • Defective messages (without at least one expected header) not shown in IMAP folders but shown on mobile devices
  • Calendar: Unintended task deletion if numlock is enabled
  • Various security fixes:
  • CVE-2018-5095: Integer overflow in Skia library during edge builder allocation
  • CVE-2018-5096: Use-after-free while editing form elements
  • CVE-2018-5097: Use-after-free when source document is manipulated during XSLT
  • CVE-2018-5098: Use-after-free while manipulating form input elements
  • CVE-2018-5099: Use-after-free with widget listener
  • CVE-2018-5102: Use-after-free in HTML media elements
  • CVE-2018-5103: Use-after-free during mouse event handling
  • CVE-2018-5104: Use-after-free during font face manipulation
  • CVE-2018-5117: URL spoofing with right-to-left text aligned left-to-right
  • CVE-2018-5089: Memory safety bugs fixed in Firefox 58, Firefox ESR 52.6, and Thunderbird 52.6

New in Thunderbird 52.5.2 (Dec 22, 2017)

  • Fixed:
  • This releases fixes the "Mailsploit" vulnerability and other vulnerabilities detected by the "Cure53" audit.

New in Thunderbird 52.5.0 (Nov 24, 2017)

  • New:
  • Better support for Charter/Spectrum IMAP: Thunderbird will now detect Charter's IMAP service and send an additional IMAP select command to the server. Check the various preferences ending in "force_select" to see whether auto-detection has discovered this case.
  • Fixed:
  • In search folders spanning multiple base folders clicking on a message sometimes marked another message as read
  • IMAP alerts have been corrected and now show the correct server name in case of connection problems
  • POP alerts have been corrected and now indicate connection problems in case the configured POP server cannot be found
  • Various security fixes.

New in Thunderbird 58.0b1 Beta (Nov 23, 2017)

  • Bug 1415541 - No need to destroy frames if Destroy was called on the shell.
  • Bug 1417010 - Invalidate MathML display items whenever we invalidate the referenced nsMathMLChar.
  • Bug 1417442 - P4. Indicate surface type in decoder description.
  • Bug 1417442 - P3. Don't enable nv12 surfaces if we failed to parse the version string.
  • Bug 1417442 - P2. Fix nsIGfxInfo in GPU process. r=dvander, a=sledru
  • Bug 1417442 - P1. Don't attempt to initialize MediaPrefs in the GPU process.
  • Bug 1416448 - Don't update the ASR during merging for an empty container item, since we can't compute the ASR of the contents. r=miko
  • Bug 1416028 - Prevent browser_pluginCrashedCommentAndURL.js from leaking crash dump files.
  • Bug 1378524 - Fix "TypeError: tab is null" exception raised from browser_inspector_extension_sidebar.js when running on beta.
  • Bug 1418227 - Socket timeout is lost in TcpTransport.connect().
  • Bug 1418227 - Indicate that sock instance is private.
  • Bug 1418227 - TcpTransport.sock should not be used by consumers.
  • Backed out changesets cdaf608ce668 and 001b6191ff91 (bug 1416448) for build bustage. r=backout a=backout on a CLOSED TREE
  • Bug 1416448 - Don't update the ASR during merging for an empty container item, since we can't compute the ASR of the contents: fix merge conflict. r=bustage-fix a=bustage-fix on a CLOSED TREE
  • Bug 1412090 - patch 4 - Also adopt the ContentParent::NotifyUpdatedFonts method on macOS, so that only the parent process needs to register with CFNotificationCenter for font-changed notifications.
  • Bug 1412090 - patch 3 - Check the sandbox policy to verify font files will be readable by the content process before including them in the system font list.
  • Bug 1412090 - patch 2.1 - Work around FcNameParse bug in fontconfig versions around 2.11.0, by escaping any leading space in the encoded charset element.

New in Thunderbird 52.4.0 (Oct 7, 2017)

  • New: In Thunderbird 52 a new behavior was introduced for replies to mailing list posts: "When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header". A new preference mail.override_list_reply_to allows to restore the previous behavior.
  • Fixed: Under certain circumstances (image attachment and non-image attachment), attached images were shown truncated in messages stored in IMAP folders not synchronised for offline use.
  • Fixed: IMAP UIDs > 0x7FFFFFFF not handled properly
  • Fixed: Various security fixes, details at https://www.mozilla.org/en-US/security/advisories/mfsa2017-20/

New in Thunderbird 56.0b3 Beta (Aug 21, 2017)

  • Bug 1390002 - There are some paths to find out if dwrite is enabled, which inits gfxPlatform, which requires information from PopulateScreenInfo, which depends on the refresh driver existing. At this time however, we haven't initialized our vsync source so we crash. This moves vsync initialization earlier in the gfx pipelineBug 1388166 - Handle case where chromeWin.getBrowser() doesn't exist.
  • Bug 1350152 - Don't rely on gBrowser in nsLoginManagerPrompter.js
  • Bug 1387524 - Back out removal of MOZ_PRETTY to build Thunderbird 56 beta.
  • Bug 1388319 - Mark ServoStyleSet dirty in its Init
  • Bug 1376754 - Remove hide event target flag from accessible when event is dropped.
  • Bug 1389300 - Don't mix style backend types in nsComputedDOMStyle.
  • Bug 1389300 - Inherit style backend into NS_NewDOMDocument.
  • Bug 1390002 - There are some paths to find out if dwrite is enabled, which inits gfxPlatform, which requires information from PopulateScreenInfo, which depends on the refresh driver existing. At this time however, we haven't initialized our vsync source so we crash. This moves vsync initialization earlier in the gfx pipeline.
  • Bug 1363723 - Preserve array in aria owns hash
  • Bug 1384944 - Replace NS_ConvertASCIItoUTF16 by NS_ConvertUTF8toUTF16.
  • Bug 1382057 - Skip browser_applications_selection.js on Linux. a=test-only
  • Bug 1254136 - Fix double registration for sessionstore-windows-restored.

New in Thunderbird 52.3.0 (Aug 21, 2017)

  • Various security fixes
  • Large attachments taking a long time to open under some circumstances
  • No authorisation prompt displayed when inserting image into email body although image URL requires authentication
  • Selected text from another message sometimes included in a reply
  • Inline images not scaled to fit when printing
  • Message disposition flag (replied / forwarded) lost when reply or forwarded message was stored as draft and draft was sent later
  • Deleting message from the POP3 server not working when maildir storage was used
  • Unwanted inline images shown in rogue SPAM messages

New in Thunderbird 56.0b2 Beta (Aug 10, 2017)

  • Bug fixes:
  • Bug 1386027 - Simplify handleError interfaces for SessionCallback and TelemetryCollector.
  • Bug 1365556 - Invalidate widget style contexts after their ancestors are set.
  • Bug 1385123 - [Onboarding] Fix word wrapping when focusing on tour items under some languages
  • Bug 1388166 - Handle case where chromeWin.getBrowser() doesn't exist.
  • Bug 1385902 - Extend the width of preferences search field.
  • Bug 1386960 - Call nsTextInputListener's callback manually after using the non-transaction based editor code path for setting values of input controls.
  • Bug 1384655 - Remove obsolete latency measuring macros in downstream code we don't use anymore
  • Bug 1387890 - Pass parentId for tabs opened by webextensions on Android.
  • Bug 1387207 - Exclude code of GeckoHLS-related components if ExoPlayer source code is not included.
  • Bug 1387182 - Fix border (empty space) compensation when dragging items in customize mode in RTL.
  • Bug 1386533 - Fix host permitted matching.
  • Bug 1386323 - Perform HTTP response throttling only for a limited time after new transactions are actived
  • Bug 1387090 - Properly handle DontThrottle flag in all places in nsHttpTransaction.
  • Bug 1386558 - Check sandboxing level 2 after permissions are available.
  • Bug 1386915 - Add nsLookAndFeel::NativeInit() virtual call for initializing native-side state.

New in Thunderbird 56.0b1 Beta (Aug 7, 2017)

  • Fixed bugs:
  • Bug 1275423 - Update failing DSA signature tests
  • Bug 1385864 - Drop invalid optional_permissions from manifests.
  • Bug 1386560 - Fix the typo of firefoxAccountCategory header's class list because all level 1 headers should have the subcategory class.
  • Bug 1386305 - (DLC) Remove outdated bootstrap catalog.
  • Bug 1375490 - Part 2: Support alerts in OOP extension sidebars.
  • Bug 1386737 - Fix broken top sites with pinned links lacking title for Activity Stream.
  • Bug 1386182 - Set FeatureState after EnableByDefault() in gfxWindowsPlatform::InitializeD3D11Config. r=jerry, a=lizzard
  • Bug 1386314 - Add default icons, enable snippets and bug fixes to Activity Stream.
  • Bug 1385090 - Pass Remote Pages instance from AboutNewTab on override.
  • Bug 1386350 - Turn off snippets in activity stream for tests.
  • Bug 1386265 - Exclude tippy top images directory from browser_all_files_referenced.js.
  • Bug 1380449 - Do not clone when not in a Web Extension.
  • Bug 1384560 - Annotate crash reports with accessibility client information.
  • Bug 1387004 - Part 2: Record credit card enable state in TelemetryEnvironment.
  • Bug 1387004 - Part 1: Add credit card enabled pref.
  • Bug 1352711 - Add a notifications.onShown event and use it to fix an intermittent in test_ext_notifications.html.
  • Bug 1365505 - Part 2: Turn on the pref for hls not only on nightly.
  • Bug 1365505 - Part 1: Make the feature flag be exposed not only on nightly.

New in Thunderbird 52.2.1 (Jun 24, 2017)

  • Fixed:
  • Problems with Gmail (folders not showing, repeated email download, etc.) introduced in version 52.2.0.
  • Known Issues:
  • Multiple requests for master password when GMail OAuth2 is enabled

New in Thunderbird 52.2.0 (Jun 15, 2017)

  • What’s New:
  • Fixed: Embedded images not shown in email received from Hotmail/Outlook webmailer
  • Fixed: Detection of non-ASCII font names in font selector
  • Fixed: Attachment not forwarded correctly under certain circumstances
  • Fixed: Multiple requests for master password when GMail OAuth2 is enabled
  • Fixed: Large number of blank pages being printed under certain circumstances when invalid preferences were present
  • Fixed: Messages sent via the Simple MAPI interface are forced to HTML
  • Fixed: Calendar: Invitations can't be printed
  • Fixed: Mailing list (group) not accessible from macOS or Outlook address book
  • Fixed: Clicking on links with references/anchors where target doesn't exist in the message not opening in external browser
  • Various security fixes:
  • CVE-2017-5472: Use-after-free using destroyed node when regenerating trees
  • CVE-2017-7749: Use-after-free during docshell reloading
  • CVE-2017-7750: Use-after-free with track elements
  • CVE-2017-7751: Use-after-free with content viewer listeners
  • CVE-2017-7752: Use-after-free with IME input
  • CVE-2017-7754: Out-of-bounds read in WebGL with ImageInfo object
  • CVE-2017-7756: Use-after-free and use-after-scope logging XHR header errors
  • CVE-2017-7757: Use-after-free in IndexedDB
  • CVE-2017-7778: Vulnerabilities in the Graphite 2 library
  • CVE-2017-7758: Out-of-bounds read in Opus encoder
  • CVE-2017-7763: Mac fonts render some unicode characters as spaces
  • CVE-2017-7764: Domain spoofing with combination of Canadian Syllabics and other unicode blocks
  • CVE-2017-7765: Mark of the Web bypass when saving executable files
  • CVE-2017-5470: Memory safety bugs fixed in Firefox 54 and Firefox ESR 52.2, and Thunderbird 52.2
  • Known Issues:
  • Links in news messages including "remove all expired articles" not working

New in Thunderbird 54.0b3 Beta (Jun 2, 2017)

  • Bug 1365790 - Bump security preload information expiration dates to 2017-09-26 for Firefox 54.
  • Bug 1368477 - Mirror the search suggestions pref every time the user makes a choice.
  • Bug 1366446 - Ensure layers TextureClient always lives as long as the SourceSurface using it.
  • Bug 1368077 - Strip page titles from URLs on the pasteboard when dragging on OSX/macOS.
  • Bug 1367720 - Restore ability to drag & drop files from Finder to Firefox
  • Bug 1361116 - Ensure that string data is sent to the pasteboard when requested by macOS services.
  • Bug 1330470 - Restore ability to drag & drop entries from the download list to Finder on OSX
  • Bug 1358075 - Generate UTI types dynamically when needed for the new drag & drop APIs on OSX.
  • Bug 1358075 - Display friendly names for .webloc files on OSX after dragging URLs to Finder.
  • Bug 1368751 - AWSY - use proper Windows paths in checkpoint script
  • Bug 1353625 - detect zero (0) as invalid resolution.
  • Bug 1350088 - Recover when we hit "server was flushed".
  • Bug 1359837 - Block mozAddonsManager if xpinstall.enabled is false/locked.
  • Bug 1300351 - Disable browser_onbeforeunload_navigation.js on non-debug windows.
  • Bug 1332970 - Allow assertion in test_restyles.html;

New in Thunderbird 54.0b2 Beta (May 25, 2017)

  • Bug 1362611 - Fix packager quoting in the installer
  • Bug 1362611 - Fix packager quoting in the installer.
  • Bug 1358420 - Use staged rollout for fennec beta builds. r=aki,
  • Bug 1363083 - Remove TabMixPlus and Mega from e10s blocklist.
  • Bug 1336657 - On Windows add a sandbox policy rule to allow read / write access to content temp
  • Bug 1363677 - Skip Flush() and EndDraw() if the ID2D1DeviceContext is stale.
  • Bug 1358713 - When a popup's anchor does not have a frame originally, don't have the popup update its position to follow it.
  • Bug 1363253 - Ignore events specific to preview window also when decrementing.
  • Bug 1364002 - Store the user-made search suggestion choice along with userMadeSearchSuggestionChoice
  • Bug 1362918 - Extend the blacklist to cover certain Galaxy S4 models.
  • Bug 1359859 - Use the right entry global for XBL constructor/destructor/field execution.
  • Bug 1359697 - Make CaptivePortalService not poll for status when it is in the NOT_CAPTIVE state
  • Bug 1359204 - Test view-source can open link is not blocked by security policies.
  • Bug 1359204 - Use SystemPrincipal as TriggeringPrincipal when loading page as view-source.
  • Bug 1359204 - Do not query nested URI within CheckChannel in ContentSecurityManager.

New in Thunderbird 52.1.0 (Apr 30, 2017)

  • What’s New:
  • Fixed: Clicking on a link in an email may not open this link in the external browser.
  • Known Issues:
  • Large number of blank pages being printed under certain circumstances
  • Large attachments may not be shown or saved correctly if the message is stored in an IMAP folder which is not synchronized for offline use. Workaround: Set preference browser.cache.memory.max_entry_size to the value of -1 (unlimited) and create integer preference browser.cache.memory.capacity with the value of 200000 (200 MB, 25 MB per message).
  • Crash due to incompatibility with McAfee Anti-SPAM add-on. Workaround: Start in safe mode and disable McAfee Anti-Spam Extension
  • Background images not working and other issues related to embedded images when composing email
  • Crash when compacting IMAP folder

New in Thunderbird 53.0b1 Beta (Apr 7, 2017)

  • Bug 1352367 - [push-apk] deactivate dry-run option on aurora and beta
  • Bug 1349650 - [css-grid] Crashtest.
  • Bug 1349650 - [css-grid] Fix a bogus assertion
  • Bug 1353373 - Fix Edge readinglist imports
  • Backed out changeset c3e6050e17f1 (bug 1192818) for causing bug 1346872 and other regressions.
  • Bug 1351456 - Don't assume that window.load will be called after the pref has been flipped.
  • Bug 1291320 - Skip test_focus_after_navigation for "Unable to locate element: :focus"
  • Bug 1291320 - Make refresh command synchronous.
  • Bug 1291320 - Refactor page load algorithm for listener framescript.
  • Bug 1291320 - Disallow slow loading page to be put into the cache.
  • Bug 1291320 - Refactor navigation unit tests by using non-remote pages only if necessary.
  • Bug 1349581: defer nativeRegistration for android Jni to avoid thread issues
  • Bug 1314543 - Make EnsureGPUReady() returns bool to make sure GPU process is readay.
  • Bug 1317191 - Return when onPause is called before onResume and add Telemetry ping for future debugging.
  • Bug 1350844 - Fix typoed variable name.
  • Bug 1353476 - Make InputObserver refcounted.
  • Bug 1299626 - Fix "TypeError: can't access dead object" in assert.window().
  • Bug 1352406 - Re-apply bug 1321306 to make sure text wrapping works correctly in about:tabcrashed.

New in Thunderbird 52.0 (Apr 4, 2017)

  • New:
  • Folder pane toolbar and folder view selector (replacement for folder view arrows)
  • Optionally remove corresponding data files when removing an account from Thunderbird
  • Import settings from Becky! Internet Mail
  • Possibility to copy message filter
  • Dictionary setting is restored when editing a draft. Content-Language header (RFC 3282) transmitted with message
  • Calendar: Event can now be created and edited in a tab
  • Calendar: Processing of received invitation counter proposals
  • Chat: Support Twitter Direct Messages
  • Chat: Liking and favoriting in Twitter
  • Chat: XMPP: Support SASL SCRAM authentication mechanism
  • Chat: Support Jabber/XMPP Message Carbons (XEP-280)
  • Changed:
  • IMPORTANT: The way images are included in a compose window has changed. Images are now included as data URIs and not as references to parts of other messages or operating system files. This allows better interoperability with office packages such as MS Office or LibreOffice. Images linked from locations on the internet will no longer be downloaded and attached to the message automatically. This can be changed for each image individually via the Image Properties dialog or globally by setting the preference mail.compose.attach_http_images.
  • Correspondents column now default for all new folders, can be switched off with preference mail.threadpane.use_correspondents
  • When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header
  • Formatting toolbar is now left in place when delivery format is switched to plain text only
  • Messages in IMAP folders read on external device are now filtered by default
  • Folders backed by mbox storage larger than 4GB are supported without warning (unless preference mailnews.allowMboxOver4GB is set to false)
  • IMAP caching now uses Mozilla's latest caching technology
  • Chat: Removed Yahoo! Messenger support (since Yahoo removed support)
  • Fixed:
  • Message preview pane non-functional after IMAP folder was renamed or moved
  • Editing in paragraph format: Pressing Shift+Enter sometimes doesn't move the cursor to the next line
  • Various corrections when composing messages in paragraph format
  • Paste as quotation doesn't always work
  • Long lines in plain text replies not properly wrapped
  • Undesired white-space before signature in paragraph mode
  • When attachment unavailable, compose shows endless "Attaching..." message instead of error
  • Text encoding of reply sometimes incorrect (uses encoding of last viewed message)
  • Text encoding of message display, reply or forwarded message sometimes incorrect (uses encoding of attachment)
  • Delivery Format not preserved for saved drafts (Auto-Detect|Plaintext|HTML|Both)
  • Reply to own e-mail does not reply with the correct identity
  • IMAP message part caching
  • Links with escaped non-ASCII (international) characters can't be clicked
  • Calendar: Events specified in timezone "local time" generate alerts in UTC time
  • Chat: XMPP Resource collisions

New in Thunderbird 45.8.0 (Mar 7, 2017)

  • Various security fixes.

New in Thunderbird 52.0b4 Beta (Feb 25, 2017)

  • NEW:
  • Pages containing insecure password fields now display a warning directly within username and password fields.
  • Send and open a tab from one device to another with Sync
  • CHANGED:
  • Improved text input with some third-party keyboard layouts on Windows, e.g., keyboard layouts which have chained dead keys, inputs two or more characters with a non-printable key or a dead key sequence, inputs a character even when a dead key sequence failed to compose a character.
  • Implemented the Strict Secure Cookies spec which forbids insecure (http:) sites from setting cookies with the "secure" attribute, and in some cases prevents an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain.
  • Removed NPAPI support for plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.
  • Removed Battery Status API to reduce fingerprinting of users by trackers
  • Improved experience for downloads:
  • Notification in the toolbar when a download fails
  • Quick access to five most recent downloads rather than three
  • Larger buttons for canceling and restarting
  • DEVELOPER:
  • Enabled CSS Grid Layout
  • Screen sharing shows a preview and no longer requires a whitelisted domain
  • Responsive Design Mode redesigned and enhanced with device selection, network throttling, and more

New in Thunderbird 52.0b3 Beta (Feb 16, 2017)

  • Bug 1332508 - Reinitialize allocator mutexes in fork() child processes.
  • Bug 1286613 - Update jemalloc 4 to c6943ac.
  • Bug 1286613 - Add dummy implementations for most remaining OSX zone allocator functions.
  • Bug 1286613 - Don't rely on OSX SDK malloc/malloc.h for malloc_zone struct definitions.
  • Bug 1286613 - Use the same zone allocator implementation as replace-malloc for mozjemalloc
  • Bug 1286613 - Move replace-malloc zone allocator to a separate file.
  • Bug 1286613 - Properly call mozjemalloc pre/post fork hooks on OSX when replace-malloc is enabled.
  • Bug 1275204 - mozjemalloc: Use the JS arm64 allocator on Linux/sparc64.
  • Bug 1275204 - mozjemalloc: Use better pre-processor defines for sparc64.
  • Bug 1322027 - Don't disable hugepage support since it no longer causes PGO issues.
  • Bug 1322027 - Update jemalloc 4 to version 4.4.0. r=glandium a=jorgk
  • Bug 1325707 - Change IPC_OK() to true to fix bustage in VideoDecoderParent.cpp.
  • Bug 1325707: P2. Handle OOM conditions when creating MediaRawData object.
  • Bug 1325707: P1. Check returned value.
  • Bug 1335854 - Tone down non-zero refcount message for dynamic atoms.

New in Thunderbird 45.7.1 (Feb 8, 2017)

  • Fixed: Crash when viewing certain IMAP messages (introduced in 45.7.0)

New in Thunderbird 45.7.0 (Jan 26, 2017)

  • Fixed:
  • Message preview pane non-functional after IMAP folder was renamed or moved
  • "Move To" button on "Search Messages" panel not working
  • Message sent to "undisclosed recipients" shows no recipient (non-functional since Thunderbird version 38)
  • Calendar: No way to accept/decline email invitations when sent and received messages are stored in the same folder
  • Various security fixes

New in Thunderbird 51.0b2 Beta (Jan 18, 2017)

  • Bug fixes:
  • Bug 1331340 - FileReader should not continue when allocation fails.
  • Bug 1303668 - Failing to find a symbols url should be a warning instead of a exception.
  • Bug 1330693 - Try to handle SW job double-completion better.
  • Bug 1331317 - only enable the pref 'media.block-autoplay-until-in-foreground' on Nightly.
  • Bug 1321300 - Back out bug 1264768 and add test.
  • Bug 1323837 - Draw nothing if there are no color stops for gradient effect.
  • Bug 1331038 - Make nsPipe handle OOM conditions gracefully.
  • Bug 1330979 - Don't raise NS_ERROR_DOM_SECURITY_ERROR on DataTransfer access violations
  • Bug 1330710 - Make gfxFontconfigFont keep track of its actual adjusted size.
  • Bug 1330273 - Add some security checks about the use of the string buffer in FileReader.
  • Bug 1329090 - Fix the misuse of the variable.
  • Bug 1307458 - Update LayerManager pointer of all Layers of LayerTransactionParent.
  • Bug 1307347 - Longer timeout for browser_console_history_persist.js.
  • Bug 1331058 - Fix analysis check in IonBuilder::initEnvironmentChain

New in Thunderbird 51.0b1 Beta (Jan 12, 2017)

  • Bug 1329941 - [compact layout] Increase tile title background opacity to improve legibility.
  • Bug 1329044 - Avoid taking const references to fields behind accessors.
  • Bug 1325141 - Fix leak in Z-constrained windows on OS-X.
  • Bug 1128311 - Only flush the DNS cache when the last private browsing window is closed;
  • Bug 1328834 - Check hasScript in IonBuilder::createThisScriptedSingleton.
  • No bug - Tagging ce55e4d276031458f0730d481acff05d7c797038 with FIREFOX_51_0b13_BUILD1, FIREFOX_51_0b13_RELEASE a=release CLOSED TREE
  • Bug 1329309 - remove deprecated SkOpts_sse41 blits
  • Bug 1327996 - Disabled buttons in devtools now do show tooltips
  • Bug 1318769 - add reftest to verify that color emoji show up.
  • Bug 1318769 - make SkFontHost_cairo match cairo-ft's handling of FcPattern embeddedbitmap option
  • Bug 1318630 - Part 2: Create correct html element object when "is" is specified for custom element;
  • Bug 1318630 - Part 1: Fix missing control pref checks for custom element feature;
  • Bug 1315146 - Avoid using the Web-facing Range methods in nsTextControlFrame::SetSelectionInternal();
  • Bug 1309111 - Some macros are not expanded correctly by MSVC.
  • Bug 1304266 - Remove libevent workaround for MacOS 10.4 bug

New in Thunderbird 45.6.0 (Dec 29, 2016)

  • FIXED:
  • The system integration dialog was shown every time when starting Thunderbird
  • VARIOUS SECURITY FIXES:
  • CVE-2016-9899: Use-after-free while manipulating DOM events and audio elements:
  • Use-after-free while manipulating DOM events and removing audio elements due to errors in the handling of node adoption.
  • CVE-2016-9895: CSP bypass using marquee tag:
  • Event handlers on marquee elements were executed despite a strict Content Security Policy (CSP) that disallowed inline JavaScript.
  • CVE-2016-9897: Memory corruption in libGLES:
  • Memory corruption resulting in a potentially exploitable crash during WebGL functions using a vector constructor with a varying array within libGLES.
  • CVE-2016-9898: Use-after-free in Editor while manipulating DOM subtrees:
  • Use-after-free resulting in potentially exploitable crash when manipulating DOM subtrees in the Editor.
  • CVE-2016-9900: Restricted external resources can be loaded by SVG images through data URLs:
  • External resources that should be blocked when loaded by SVG images can bypass security restrictions through the use of data: URLs. This could allow for cross-domain data leakage.
  • CVE-2016-9904: Cross-origin information leak in shared atoms:
  • An attacker could use a JavaScript Map/Set timing attack to determine whether an atom is used by another compartment/zone in specific contexts. This could be used to leak information, such as usernames embedded in JavaScript code, across websites.
  • CVE-2016-9905: Crash in EnumerateSubDocuments:
  • A potentially exploitable crash in EnumerateSubDocuments while adding or removing sub-documents.
  • CVE-2016-9893: Memory safety bugs fixed in Thunderbird 45.6:
  • Mozilla developers and community members Jan de Mooij, Iris Hsiao, Christian Holler, Carsten Book, Timothy Nikkel, Christoph Diehl, Olli Pettay, Raymond Forbes, and Boris Zbarsky reported memory safety bugs present in in Thunderbird ESR 45.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.

New in Thunderbird 45.5.1 (Dec 1, 2016)

  • Various security fixes:
  • 2016-92: Firefox SVG Animation Remote Code Execution.

New in Thunderbird 50.0b3 Beta (Oct 28, 2016)

  • Bug 1026404 - Disable OES_EGL_image and OES_EGL_image_external on SGX 544 MP devices. r=eflores a=ritu
  • EGLImageTargetTexture2D crashes on SGX 544 MP GPUs on Kit Kat with either GL_TEXTURE_2D or GL_TEXTURE_EXTERNAL as the texture target. This means that both OES_EGL_image and OES_EGL_image_external extensions do not work and must be avoided.
  • No bug, Automated blocklist update from host bld-linux64-spot-097 - a=blocklist-update
  • Backed out changeset 5ebcf218f678 (bug 1292273) for browser_Troubleshoot.js failures.
  • Bug 1280878 - Update safebrowing_notification test for changed Google URL. r=francois, a=test-only
  • Bug 1308859 - Do not hold on to pointers into mStyleStack across a presshell flush. r=jrmuizel, a=ritu
  • Bug 1311409 - Eyedropper click doesn't work, have to use Enter key. r=me, a=ritu
  • Bug 1292273 - Add logs to record the failure of compositor creation. r=dvander, a=ritu
  • Bug 1292273 - Skip CompositorD3D11::EndFrame when device-removed happened and add some logs for tracking the behavior. r=dvander, a=ritu
  • Bug 1305204 - Backout bug 1275746. a=ritu
  • Bug 1311557 - Ensure custom sync engines aren't reported in sync ping. r=markh, a=ritu
  • Bug 1294605 - Notify MediaStreamTrackSource when ReadyState is overriden. r=jib, a=ritu
  • Bug 1312958 - Part 2: Only delete the trackinfo object once the decoder has been shutdown. r=gerald, a=ritu
  • While it's unlikely to have been a problem as the decoder would have been idled at this stage. During the time the TrackInfo was reset and the decoder actually be shut down, the reference to the object would have been invalid causing a potential UAF.
  • Bug 1312958 - Part 1: Do not modify original Audio/Video info. r=gerald, a=ritu
  • The issue is particularly problematic with the Apple audio decoder. The Apple decoder relies on the sampling rate to configure the CoreAudio transform.
  • The actual output rate may be different (such as with HE-AAC). Should the decoder ever need to be reset again, future initialization would have failed as the initial rate was now incorrect.
  • Bug 1312530 - Force windowless plugin mode in 64-bit builds if async rendering is disabled. r=akotz, a=ritu
  • Bug 1310814 - Add ObjC exception guards. r=spohl, a=ritu
  • With the added safety checks it's unlikely that anything in this function will fire ObjC exceptions, but our rule is to have guards around every Objective C function that can directly be called from C++ files.
  • Bug 1310814 - Use public NSLocale API for getting the system country code. r=spohl, a=ritu
  • This potentially changes behavior. On my machine, the old code returned
  • NS_ERROR_FAILURE because the dictionary did not have a "countryCode" entry,
  • but this new implementation correctly returns the string "CA".
  • Bug 1313198 - Bundle a fallback version of the SDK loader behind a preference. r=Mossop, a=ritu
  • Bug 1309350 - Part 2: Speed up synchronous resolution of module paths. r=gps, r=ochameau, a=ritu
  • r?gps for the build changes and ochameau for the rest.
  • This results in about a 28% speed-up for Jetpack mochitest runs, for me.
  • Bug 1309351 - Part 2: Use a shared global sandbox and simple module resolution for built-in modules. r=ochameau, a=ritu
  • This takes another 21% off the Jetpack test suite run time for me.

New in Thunderbird 45.4.0 (Oct 3, 2016)

  • Fixed:
  • Display name was truncated if no separating space before email address.
  • Recipient addresses were shown in red despite being inserted from the address book in some circumstances.
  • Additional spaces were inserted when drafts were edited.
  • Mail saved as template copied In-Reply-To and References from original email.
  • Threading broken when editing message draft, due to loss of Message-ID
  • "Apply columns to..." did not honor special folders

New in Thunderbird 45.3.0 (Sep 2, 2016)

  • Security fixes:
  • 2016-62 Miscellaneous memory safety hazards (rv:48.0 / rv:45.3)

New in Thunderbird 49.0b1 Beta (Sep 2, 2016)

  • Bug fixes:
  • Bug 1299445 - use distribution.ini directly to check if automigration is enabled.
  • Bug 1298771 - Attach last-update.log to update results for Firefox UI update tests.
  • Bug 1294054 - Use marionette.py instead of runner.py in case of crashes with no active test.
  • Bug 1284457 - Reduce default socket timeout for Marionette to 60s.
  • Bug 1244425 - Avoid CPOW when setting file array on .
  • Bug 1280947 - Dispatch DOM change event on appending file to input.
  • Bug 1280947 - Correct argument to event.sendEvent.
  • Bug 1280947 - Remove dead File object construction code.
  • Bug 1280947 - Support tuples for script arguments.
  • Bug 1280947 - Improve names of JSON marshaling methods in Marionette client.
  • Bug 1297446 - Shimwaiver for l10n.
  • Bug 1051567 - Make sure we resend file descriptors for the first chunk of a message.
  • Bug 1298505 - CSP: Update StripURIForReporting to rely on NS_SecurityCompareURIs.
  • Bug 1294536 - KeyboardLayout::InitNativeKey() shouldn't initialize NativeKey with WM_CHAR whose wParam isn't a printable character.
  • Bug 1299256 - Fix performance issues when stripping comments from large locale files.
  • Bug 1293308 - System font setting respected by location bar but ignored by location bar's autocomplete drop-down list.

New in Thunderbird 45.2.0 (Jul 1, 2016)

  • FIXED:
  • Invitations to events could not be printed.
  • Dragging and dropping of contacts from the contact list onto an addressbook while All Addressbooks is selected moved only one contact
  • Falsely reported not enough disk space during compacting
  • Links were not always detected properly in the message body (terminated early on "|", some long links not detected at all)

New in Thunderbird 47.0b2 Beta (Jun 20, 2016)

  • Bug 1255245: ESR45 generates mar files with the wrong channel ID: Always modify update-settings.ini.
  • Bug 1275339 - [ffmpeg] Don't assume AVFrame has a constant size.
  • Bug 1276027 - Add a Telemetry probe to track how often Firefox is used as the default handler.
  • Bug 1276931. Add VsyncSource::Shutdown which shuts down global display.
  • Bug 1277882 - Disable e10s on Linux when recent accessibility use is detected.
  • Bug 1278851 - Enable service worker notifications everywhere except for non-release B2G.
  • Bug 1278435 - Update DOM interface tests to reflect shipping Push on Android.
  • Bug 1275095 - Enable MOZ_ANDROID_CGM for all builds;
  • Bug 1258375, bump NSS version requirement to 3.24,
  • Bug 1275311 - Get property when in content in security notification UI test;
  • Bug 1275249 - Update UI tests to get property where applicable
  • Bug 1271911 - Wait for the expected notifications in test_notifications.py to avoid transient popups.
  • Bug 1271911 - Enable the browser.tabs.remote.force-enable preference when using e10s.
  • Bug 1278605 - ensure that nsICertOverrideService can be implemented in JS
  • Bug 1270641 - Choose winner of expanded-firstrun.
  • Bug 1265281 - (Beta rebase) Blacklist atiumd64.dll versions for D3D9 DXVA which are suspected to crash.
  • Bug 1271525 - (Beta rebase) Blacklist igdumd64.dll versions for D3D9 DXVA which are suspected to crash.
  • Bug 1271525 - (Beta rebase) Add ability to blacklist D3D9 DXVA via pref.

New in Thunderbird 45.1.1 (May 30, 2016)

  • FIXES:
  • When entering members into a mailing list, the enter key dismissed the panel instead of just moving onto the next line
  • Email without HTML elements was sent as HTML, despite "Delivery Format: Auto-detect" option
  • Options applied to a template were lost when the template was used.
  • Contacts could not be deleted when they were found through a search
  • Views from global searches did not respect "mail.threadpane.use_correspondents"

New in Thunderbird 45.1.0 (May 13, 2016)

  • Security fixes:
  • 2016-39 Miscellaneous memory safety hazards (rv:46.0 / rv:45.1 / rv:38.8)

New in Thunderbird 45.0 (Apr 13, 2016)

  • New - Add a Correspondents column combining Sender and Recipient
  • New - Much better support for XMPP chatrooms and commands.
  • New - Remote content exceptions: Improved options to add exceptions.
  • New - Implement option to always use HTML formatting to prevent unexpected format loss when converting messages to plain text.
  • New - Use OpenStreetmap for maps (even allow the user to choose from list of map services)
  • New - Allow spell checking and dictionary selection in the subject line
  • New - Allow editing of From when composing a message.
  • New - Add dropdown in compose to allow specific setting of font size.
  • New - Return/Enter in composer will now insert a new paragraph by default (shift-Enter will insert a line break)
  • New - Allow copying of name and email address from the message header of an email
  • New - Mail.ru supports OAuth authentication.
  • Fixed - Fixed: When sending e-mail which was composed using Chinese, Japanese or Korean characters, unwanted extra spaces were inserted within the text.
  • Fixed - Spell checker checked spelling in invisible HTML parts of the message.
  • Fixed - When saving a draft that is edited as new message, original draft was overwritten.
  • Fixed - External images not displayed in reply/forward
  • Fixed - Crashed in some cases while parsing IMAP messages.
  • Fixed - Properly preserve pre-formatted blocks in message replies.
  • Fixed - Copy/paste from a plain text editor lost white-space (multiple spaces/blanks, tabs, newlines)
  • Fixed - "Open Draft"/"Forward"/"Edit As New"/"Reply" created message composition with incorrect character encoding.
  • Fixed - Fixed: Grouped By view sort direction change was broken, plus enabled custom column grouping.
  • Fixed - Fixed: New emails into a mailbox did not adhere to sort order by received.
  • Fixed - Fixed: Box.com attachments failed to upload.
  • Fixed - Fixed: Drag and drop of multiple attachments failed to OS file folder.
  • Fixed - XMPP had connection problems for users with large rosters

New in Thunderbird 38.7.1 (Mar 24, 2016)

  • What’s New:
  • Changed: Disabled Graphite font shaping library
  • Security fixes:
  • 2016-37 Font vulnerabilities in the Graphite 2 library
  • 2016-35 Buffer overflow during ASN.1 decoding in NSS
  • 2016-34 Out-of-bounds read in HTML parser following a failed allocation
  • 2016-31 Memory corruption with malicious NPAPI plugin
  • 2016-27 Use-after-free during XML transformations
  • 2016-24 Use-after-free in SetBody
  • 2016-23 Use-after-free in HTML5 string parser
  • 2016-20 Memory leak in libstagefright when deleting an array during MP4 processing
  • 2016-17 Local file overwriting and potential privilege escalation through CSP reports
  • 2016-16 Miscellaneous memory safety hazards (rv:45.0 / rv:38.7)

New in Thunderbird 38.7.0 (Mar 14, 2016)

  • Various security fixes.

New in Thunderbird 45.0b2 Beta (Feb 19, 2016)

  • Bug fixes:
  • Bug 1245912 - Update Loop system add-on to version 0.3.0.
  • Bug 1229195 - explicitly link 'content' to the frame script global scope to prevent out-of-scope errors.
  • Bug 1154277 - follow-up - fix linting error by removing a leftover break statement.
  • Bug 1154277 - Part 4 - Update the loop add-on and introduce a pref to switch e10s support for Loop/ Hello on or off. The default for now is off.
  • Bug 1154277 - Part 3 - implement test changes to work in e10s mode as well.
  • Bug 1154277 - Part 2 - support running Social API documents to run in a remote browser, i.e. the content process.
  • Bug 1154277 - Part 1 - allow to swap docShells on remote browsers that are not a child of a BrowserDOMWindow.
  • Bug 1246592 - Try and fix windows locale repack bustage by adjusting how locales are built for Loop.
  • Bug 1239828 - Fix broken L10n repos, correct ifdef for inclusion of locales, and add 'id' locale that was being ignored by .gitignore.
  • Bug 1239828 - Support Loop's localisation mechanisms for Loop as a system-addon.
  • Bug 1239828 - Update Loop to the latest version.

New in Thunderbird 38.6.0 (Feb 17, 2016)

  • Security fixes:
  • 2016-14 Vulnerabilities in Graphite 2
  • 2016-03 Buffer overflow in WebGL after out of memory allocation
  • 2016-01 Miscellaneous memory safety hazards (rv:44.0 / rv:38.6)
  • 2015-150 MD5 signatures accepted within TLS 1.2 ServerKeyExchange in server signature

New in Thunderbird 46.0a2 Earlybird (Feb 12, 2016)

  • Various security fixes.
  • Fixed:
  • Filters ran on a different folder than selected.

New in Thunderbird 45.0b1 Beta (Feb 6, 2016)

  • New:
  • Allow editing of From when composing a message.
  • AB quick search and contacts side bar will search nicknames
  • Allow copying of Name and Address from an email displayed from header menu.
  • Allow printing of individual contacts from context menu
  • Mail.ru supports OAuth authentication.
  • Fixed:
  • Allow drag and drop of multiple attachments to OS file folder.
  • Fixed: CJK(Chinese, Japanese, Korean): extra space is inserted within text in mail due to wrap produced by mailnews.wraplength and line length limitation of 1000bytes of SMTP
  • Box.com attachment upload works again.
  • Fixed: New emails into a mailbox did not adhere to sort order by received.
  • Fixed broken Grouped By view sort direction change, enabled custom column grouping

New in Thunderbird 44.0b1 Beta (Jan 14, 2016)

  • Bug fixes:
  • Bug 1236643 - Reorder GeckoEditable destruction sequence
  • Bug 1234280 - Handle oom in CodeGeneratorShared::addCacheLocations
  • Backed out changeset 486e6901c1d9 (bug 1234280)
  • Bug 1224766 - Forward callID to disambiguate multiple gUM requests from same window
  • Bug 1238010 - Turn off ClosingService.
  • Bug 1208145 - Clear XUL persistence data for passwordManager.xul passwordCol.hidden.
  • Bug 1208145 - Revert bug 1121291 using hard-coded strings from Fx43
  • Bug 1233599 - Add build dependencies to appcompat-v7
  • Bug 1218473 - Add check for presence of NVIDIA Optimus drivers to WindowsNopSpacePatcher;
  • Bug 1237103 - Fix Application Reputation remote lookups.
  • Bug 1236266 - Use release assert in IPC serialization for regions
  • Bug 1236266 - Don't generate invalid empty regions in pixman
  • Bug 1236951 - New mozharness script for desktop partner repacks, and associated config files, DONTBUILD
  • Bug 1224736 - When image size lookup fails in nsTreeBodyFrame::PaintImage, only fall back to use the full destRect if we've got a VectorImage

New in Thunderbird 38.5.1 (Jan 7, 2016)

  • Changed - Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements

New in Thunderbird 38.4.0 (Nov 28, 2015)

  • Security fixes:
  • 2015-133 NSS and NSPR memory corruption issues
  • 2015-132 Mixed content WebSocket policy bypass through workers
  • 2015-131 Vulnerabilities found through code inspection
  • 2015-128 Memory corruption in libjar through zip files
  • 2015-127 CORS preflight is bypassed when non-standard Content-Type headers are received
  • 2015-123 Buffer overflow during image interactions in canvas
  • 2015-122 Trailing whitespace in IP address hostnames can bypass same-origin policy
  • 2015-116 Miscellaneous memory safety hazards (rv:42.0 / rv:38.4)

New in Thunderbird 38.3.0 (Nov 25, 2015)

  • New:
  • Saved files tab now implements Search field and Clear button.
  • Fixed:
  • (Right-)Clicking on a newsgroup now allows directly composing a message again
  • Importing to the address book from CSV now works with international characters
  • Thunderbird no longer crashes when executing filter rules when using maildir
  • When using the maildir storage format, the INBOX folder is no longer deleted
  • Emails with long References headers are now decoded correctly
  • Checking for new messages correctly works after hibernation again
  • Chat entries are no longer sometimes lost in global database at shutdown.

New in Thunderbird 42.0b2 Beta (Oct 13, 2015)

  • No bug, Automated blocklist update from host
  • backout 362678f780fb (Bug 1152743) because of mozmill failures
  • Bug 1152743 - Re-implement "Search" field and "Clear List" button in Saved Files tab (version only for TB38).
  • backout d57ca248d65f (Bug 1152743) that had unexpected string changes
  • Bug 1127580 - mozmill/content-policy/test-general-content-policy.js transition timing improvement.
  • Bug 1152651, another bustage fix for test_pop3MultiCopy2.js .
  • Bug 1193200, undue string changes from previous push
  • Bug 1152651, bustage fix for test_pop3MultiCopy2.js, Array.includes not available pre-gecko 44
  • Bug 1193200 - Remote content exceptions: Cannot add email address to blocklist with Block and Allow buttons; adding web site seems to succeed but also invisible (no new strings version).
  • Port changes from Bug 1207310 (Disable GTK3 on beta) to comm-beta
  • Bug 1152743 - Re-implement "Search" field and "Clear List" button in Saved Files tab.
  • Bug 1152651 part 2, maildir-mbox multi copy fails
  • No bug, Automated blocklist update from host
  • Bug 1187222 - Support building with GTK3 in suite/ r+a=bustagefix in a CLOSED TREE
  • Backout cset 6208e42ad6b7 for incompleteness. r+a=backout in a CLOSED TREE
  • Bug 1187222 - Support building with GTK3 in suite/ (beta changes in mozconfigs) r+a=bustagefix in a CLOSED TREE
  • Backed out changeset 156692ed2548 r+a=backout in a CLOSED TREE
  • Bug 1187222 - Support building with GTK3 in suite/ (beta changes to releng.manifests) r+a=bustagefix in a CLOSED TREE

New in Thunderbird 41.0b1 Beta (Sep 9, 2015)

  • New - Visual appearance improved on Windows 10
  • Fixed - Spellchecker no longer jumps between languages
  • Fixed - Proxy is taken into account for pop3s protocol

New in Thunderbird 38.2.0 (Aug 15, 2015)

  • Changed: Hardware acceleration is now disabled by default to avoid crashing Thunderbird
  • Fixed: A few bugs have been fixed to avoid crashing Thunderbird

New in Thunderbird 40.0b1 Beta (Jul 24, 2015)

  • Automated checkin: version bump for thunderbird 40.0b1 release.

New in Thunderbird 38.1.0 (Jul 10, 2015)

  • Bug Fixes:
  • Copy/Paste into plain text editor deletes newlines from quoted text (bug 1143570)
  • Cross-posts won't send because Newsgroups: groups are separated with comma+space, not just comma (bug 1151448)
  • Cannot send email through exchange server (NTLM) (bug 1174159)
  • Doesn't display GB2312 encoded texts correctly for Chinese Characters (bug 1174580)
  • OAuth2 authentication for GMail does not work when specified server is imap.gmail.com or smtp.gmail.com. (bug 1176773)
  • Security fixes:
  • 2015-71 NSS incorrectly permits skipping of ServerKeyExchange
  • 2015-70 NSS accepts export-length DHE keys with regular DHE cipher suites
  • 2015-67 Key pinning is ignored when overridable errors are encountered
  • 2015-66 Vulnerabilities found through code inspection
  • 2015-63 Use-after-free in Content Policy due to microtask execution error
  • 2015-59 Miscellaneous memory safety hazards (rv:39.0 / rv:31.8 / rv:38.1)

New in Thunderbird 38.0.1 (Jun 11, 2015)

  • NEW:
  • GMail supports OAuth2 authentication, removing the need to manually select "allow less secure applications" in Google options for the account. (bug 849540)
  • Ship Lightning calendar addon with Thunderbird and enable with an opt-out dialog (bug 1113183)
  • Filter sent messages (bug 11039)
  • Filter messages when archived (bug 479823)
  • Enable search in multiple/all address books (bug 170270)
  • Add support for Yahoo Messenger in Chat (bug 955574)
  • Support Internationalized domain name URLs for RSS feeds (Bug 1018589)
  • Show expanded columns in folder pane (bug 464973)
  • Allow file-per-message (maildir) local message storage (bug 845952)
  • Add a Learn more link to the support page in feeds subscribe dialog (bug 1053782)
  • Add reading position marker line to conversations (bug 760762)
  • The editor for twitter should show inputtable character count (bug 736002)
  • CHANGED:
  • Thunderbird will no longer use SHA-1 to sign messages (bug 1018259)
  • Removed rarely used character sets: T.61-8bit, non-encoding Mac encoders, VISCII, x-viet-tcvn5712, x-viet-vps x-johab, ARMSCII8 , map us-ascii to windows-1252, ISO-8859-6-I and -E and ISO-8859-8-E, (bug 1068505 and others.)
  • Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on some servers (bug 912216)
  • Make OpenSearch queries open in the user's default browser (bug 1120777)
  • Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates (bug 1122567, bug 1122666)
  • FIXED:
  • Replied/forwarded icons disappear after folder repair, detach/delete (bug 840418)
  • Attachment "Save As" files are displayed in Tools/Saved Files (bug 914517)
  • Adding unknown email addresses to Mailing list, then deleting ghost duplicate entries from contacts pane, caused dataloss in mailing list (bug 628035)
  • Web site from RSS feed was not rendered correctly (bug 662907)
  • Email address with leading/trailing whitespace displayed wrongly with added quotes when composing ["foo"@bar.com] (bug 286760)
  • Force display of Sender header if S/MIME sender is the signer (bug 332639)
  • Addressing autocomplete widget: Typed text in red despite results/matches found if suggestions change by last input (bug 1042561)
  • Status bar not accessible (bug 934875)
  • Wrong folder may be deleted when requesting junk delete (bug 1018960)
  • Severe UI stutter or freezes getting new mail for very large folders (bug 870556)
  • Automatically rejoin multi-user conversations on reconnect for XMPP (bug 1014472)
  • Various improvements when using IRC on moznet (bug 1083768 and others)
  • Significantly improve XMPP support (bug 1085022 and others)
  • Fixes for connecting to non-standard IRC networks (bug 870556 and others)
  • Automatically reclaim IRC nicks during a reconnect (bug 1087566)
  • Changing location in editor doesn't preserve the font when returning to end of text/line (bug 756984)
  • Inline spell checker loses red underlines after a backspace is used (bug 1100966)

New in Thunderbird 38.0b6 Beta (May 25, 2015)

  • Bug 1158761 - Part 1: Make CheckPluginStopEvent run asynchronously.
  • Bug 1158761 - Part 2: Update checks for plugin stop event in tests.
  • Bug 960762 - Fix intermittence of Notification mochitests.
  • Bug 978846 - Add a file to the tree to tell mozharness what arguments from try are acceptable to pass on to the harness process.
  • Bug 1149842 - Release the mutex for NS_OpenAnonymousTemporaryFile to prevent the deadlock.
  • ug 1163841 - Always call eglInitialize(), but kill the preloading hack (which was crashing before).
  • Bug 1166240 - Add pocket.svg to aero section of toolkit's windows/jar.mn.
  • Bug 1164866 - Bump mozharness.json to rev 6f91445be987.
  • ug 1151619 - Add Adjust SDK license.
  • Bug 1147487 - Don't try to reader-ize non-HTML documents.
  • Bug 1160407 - Redirect links within the Pocket panel to open in non-private windows when temporary Private Browsing is used.
  • Bug 1165416 - Update Pocket code to latest version (May 15th code drop).
  • Bug 1163917 - Remove the widget from its area if the conditionalDestroy promise is resolved truthy.
  • Bug 1165135 - Distribution directory not removed on pave over install.
  • Bug 1164426 - Build reader mode blocklist.
  • Bug 1164940 - Lazily create iframe.

New in Thunderbird 31.7.0 (May 15, 2015)

  • Security fixes:
  • 2015-57: Privilege escalation through IPC channel messages
  • 2015-54: Buffer overflow when parsing compressed XML
  • 2015-51: Use-after-free during text processing with vertical text enabled
  • 2015-48: Buffer overflow with SVG content and CSS
  • 2015-47: Buffer overflow parsing H.264 video with Linux Gstreamer
  • 2015-46: Miscellaneous memory safety hazards (rv:38.0 / rv:31.7)

New in Thunderbird 38.0b4 Beta (May 2, 2015)

  • Bug 1159300 - Add a clone of gmp-fake that doesn't do decryption.
  • Bug 1159300 - Don't use decrypting Gecko Media Plugins for non-encrypted playback.
  • Bug 1158568 - Fix potential size overflow.
  • Bug 1156131 - mingw cross compilation fixup.
  • Bug 1154791 - Remember all ranges for all selections when splitting nodes in the editor transactions - missing files from merge conflict
  • Bug 1154791 - Remember all ranges for all selections when splitting nodes in the editor transactions;
  • Bug 756984 - Collapse the selection on the last text node on the line, skipping br and inline frames when clicking past the end of line;
  • Bug 1100966 - Remember all ranges for all selections when joining nodes in the editor transactions;
  • Bug 1155474 - Consider the input to MThrowUninitializedLexical implicitly used.
  • Backed out changeset daaa2c27b89f (bug 1155474) for bustage.
  • Bug 1149605 - Avoid potential integers overflow.
  • Bug 1155474 - Consider the input to MThrowUninitializedLexical implicitly used.
  • Bug 1154703 - Avoid using WARP if nvdxgiwrapper.dll is around.
  • Bug 1158627 - WebRTC return error if GetEmptyFrame returns null.

New in Thunderbird 38.0b3 Beta (Apr 25, 2015)

  • Bug 1139591 - Skip browser_timeline_overview-initial-selection-01.js on OSX debug.
  • Bug 1156560 - Prefer old CDMs on update if they are in use.
  • Bug 1156913 - Use highlighttext color also for :active menus.
  • Bug 1155684 - Part 1-3: Remove reading list sync integration.
  • Bug 1155684 - Part 0: Disable reading list sync in confvars.sh.
  • Bug 1154960 - Fennec should explicitly block the DOM SiteSpecificUserAgent.js file from packaging.
  • Bug 1152550 - Make sure that cross-global Iterator cannot be broken.
  • Bug 1152016 - Suppress fprintf(stderr)'s from jpeg in MJPEG decode.
  • Bug 1151628 - Re-enable MJPEG in libyuv (especially for getUserMedia).
  • Bug 1091155 - Don't check if 'playing' has fired for it depends on how fast decoding is which is not reliable.
  • Bug 1157702 - Re-disable Reading List for Fx 38.0.5.
  • Bug 1155083 - Properly hide reader view tablet on landscape tablets.
  • Bug 1152354 - Remove no longer needed assertion expectation.
  • Bug 1108104 - Fix rebase bustage.

New in Thunderbird 38.0b2 Beta (Apr 17, 2015)

  • Bug fixes:
  • Bug 1148923 - min-width the font menulists
  • Bug 1154814 - Move font rules from 'rt' to 'rtc, rt' and make text-emphasis conditional.
  • Bug 1153973 - Don't blindly apply deletions as insertions.
  • Bug 1152121 - Factor out logic to get original URL from reader URL into shared place, and handle malformed URI excpetions.
  • Bug 1141931 - Part 0: Fix unicode-bidi value of ruby elements in html.css.
  • Bug 1145981 - Do not crash when a DIB texture is updated without a compositor.
  • Bug 847903 - Skip 691096-1.html on OSX 10.6 due to intermittent crashes.
  • Bug 1120748 - Resolve intermittent failure of browser_ssl_error_reports.js.
  • Bug 1021174 - Skip test_bug495145.html on OSX 10.6 due to intermittent crashes.
  • Bug 1097721 - Skip test_mozaudiochannel.html on OSX 10.6 due to intermittent crashes.
  • Bug 1092202 - Skip testGetUserMedia for frequent failures.
  • Bug 1150862, make about:reader unlinkable from content on desktop.
  • Bug 1150703 - Allow about: pages to be unlinkable even if "safe for content”.
  • Bug 1154447 - add aero asset for update badge.
  • Bug 1148071 - Fix CDM update behavior.

New in Thunderbird 31.6.0 (Apr 1, 2015)

  • Security fixes:
  • 2015-40 Same-origin bypass through anchor navigation
  • 2015-37 CORS requests should not follow 30x redirections after preflight
  • 2015-33 resource:// documents can load privileged pages
  • 2015-31 Use-after-free when using the Fluendo MP3 GStreamer plugin
  • 2015-30 Miscellaneous memory safety hazards (rv:37.0 / rv:31.6)

New in Thunderbird 37.0b1 Beta (Mar 11, 2015)

  • Bug fixes:
  • Bug 1121417 - Change hiddenOneOffs pref to use unichar type.
  • Bug 1106926 - Ensure that removing a hidden one click search provider also removes it from the browser.search.hiddenOneOffs pref
  • Bug 453969 - Fix the race in test_bug382113.html so we don't set our child-onload-fired boolean to false _after_ the child onload has already fired.
  • Bug 949971 - Set longer timeout for test_input_typing_sanitization.html.
  • Bug 1130150 - mSources update.
  • Bug 1133634 - Fix CanPlayType in GStreamer backend.
  • Bug 981869 - Blacklist crashy flump3dec gstreamer plugin.
  • Bug 1136616 - Allow underscores in reference DNS-IDs in mozilla::pkix name matching.
  • Bug 1051556 - Simplify GeckoEditable exception messages.
  • Bug 1136533 - Remove about:media page.
  • Bug 1140638 - Disable CSP referrer directive.

New in Thunderbird 31.5.0 (Feb 25, 2015)

  • Security fixes:
  • 2015-24 Reading of local files through manipulation of form autocomplete
  • 2015-19 Out-of-bounds read and write while rendering SVG content
  • 2015-16 Use-after-free in IndexedDB
  • 2015-12 Invoking Mozilla updater will load locally stored DLL files
  • 2015-11 Miscellaneous memory safety hazards (rv:36.0 / rv:31.5)

New in Thunderbird 36.0b1 Beta (Feb 9, 2015)

  • Bug 1109467 - Appear.in added to screensharing whitelist.
  • Bug 1116891 - Do fallback with RC4 cipher suites after PR_CONNECT_RESET_ERROR.
  • Bug 1029545 - Disable browser_dbg_variables-view-popup-14.js for frequent failures on all platforms.
  • Bug 1114976 - Don't try to free TextureClients if allocation failed.
  • Bug 1128521 - Don't use API 17+ method in search activity.
  • Bug 1128179 - Avoiding crash when appending data after decoder initialization failed.
  • Bug 1127557 - Invalid preference type getting/setting loop.ot.guid.
  • Bug 1126490 - Part 1: Recover when catastrophic circumstances cause us to lose frames in RasterImage.
  • Bug 1126490 - Part 2: Recover from loss of surfaces in VectorImage.
  • Bug 1129567: Revert page-mod to a non-e10s compliant version to fix jank when loading amazon.com.
  • Bug 1124563 - Fixup base shape table after moving GC.
  • Bug 1115153 - Loop: Create API to allow web to retrieve the loop.gettingStarted.seen pref.
  • Bug 1125764 - Allow tour pages to hide UITour annotations and menus when losing visibility.
  • Bug 1118831 - Loop: Click to add Hello icon to toolbar.

New in Thunderbird 31.4.0 (Jan 14, 2015)

  • Fixed:
  • The previous issues with jp mac builds have now been fixed, and Thunderbird will no longer need to be run in 32-bit mode.
  • Installing extensions within Thunderbird no longer requires download and installing as a file
  • Security fixes:
  • 2015-04 Cookie injection through Proxy Authenticate responses
  • 2015-03 sendBeacon requests lack an Origin header
  • 2015-01 Miscellaneous memory safety hazards (rv:35.0 / rv:31.4)

New in Thunderbird 31.3.0 (Dec 2, 2014)

  • FIXED:
  • Fixes an issue where using LDAP autocomplete could end up with blank entries in the compose addressing list (Bug 1045753)
  • Fixes an issue where IRC participants were not removed from the display on leaving a channel.
  • Fixes a regression where Thunderbird wasn't respecting the skip integration option on the default client dialog.
  • SECURITY FIXES:
  • 2014-90 Apple CoreGraphics framework on OS X 10.10 logging input data to /tmp directory
  • 2014-89 Bad casting from the BasicThebesLayer to BasicContainerLayer
  • 2014-88 Buffer overflow while parsing media content
  • 2014-87 Use-after-free during HTML5 parsing
  • 2014-85 XMLHttpRequest crashes with some input streams
  • 2014-83 Miscellaneous memory safety hazards (rv:34.0 / rv:31.3)

New in Thunderbird 34.0b1 Beta (Nov 11, 2014)

  • Fixed bugs:
  • Bug 1023539: Fix occasional timeouts of TURN webrtc transports with one-way connections.
  • Bug 1069762 - Make CSP violation reports match the spec for redirects.
  • Bug 1085509 - Add telemetry for how many permanent certificate overrides users have.
  • Bug 1087104 - Set the partialInfo property for Balrog.
  • Bug 1087104 - Implement partial mar generation in make for 'mach build’.
  • Bug 1085026 - Use sha512 hashes for mar files.
  • Bug 1084163 - Remove 'make check' from automation/build.
  • Bug 1077597 - force -j1 for {pretty-}package-tests.
  • Bug 1013730 - Have mach ignore broken disk io stats.
  • Bug 1072073 - pretty-l10n-check should also be -j1.
  • Bug 978211 followup, make compare-mozconfig work on Win64 again.

New in Thunderbird 31.2.0 (Oct 14, 2014)

  • FIXED:
  • Fixed a case where having a contact and card in an address book with the same name could send to the mailing list (Bug 1008718)
  • Security fix:
  • MFSA 2014-73: RSA Signature Forgery in NSS

New in Thunderbird 31.1.2 (Sep 25, 2014)

  • FIXED: Fixed an issue where anchor links would not work in HTML emails (Bug 974857)
  • Security fixes:
  • MFSA 2014-73: RSA Signature Forgery in NSS

New in Thunderbird 33.0b1 Beta (Sep 20, 2014)

  • Bug 996753 - Workaround for Fx33 not having AppConstants.
  • Bug 1067088 - Use aBorderArea when not skipping any sides (e.g. ::first-letter), not the joined border area.
  • Bug 1063052 - In case a user ends up with unpacked chrome, on update use omni.ja again by removing chrome.manifest.
  • Bug 1000338 - nsICacheEntry.lastModified not properly implemented.
  • Bug 1057247 - Increase favicon refetch time to four hours.
  • Bug 1060888 - Autocomplete drop down list item should not be copied to the search fields when mouse over the list item.
  • Bug 1066794 - Make the search suggestions popup on about:home/about:newtab more consistent with the main search bar's popup.
  • Bug 1039028 - Show license info for OpenH264 plugin.
  • Bug 1063896 - Loop over all url list, not just ones with metadata.
  • Bug 1066190 - Ensure that pinning checks are done for otherwise overridable errors.
  • Bug 1066726 - Concurrent HTTP cache read and write issues.
  • Bug 1065478 - POSTs are coming from offline application cache.
  • Bug 1058813 - Add telemetry probe for clicking sync preference.
  • Bug 1063128 - Make sure all preferences have keys.
  • Bug 996753 - Telemetry probes for changing settings and hitting back.

New in Thunderbird 31.1.1 (Sep 11, 2014)

  • What’s New:
  • FIXED: Fixed an issue where mailing lists with spaces in their names couldn't be auto-completed (Bug 1060901)
  • FIXED: Fixed an occasional start-up crash (Bug 1005336)

New in Thunderbird 31.1.0 (Sep 3, 2014)

  • Fixed:
  • MFSA 2014-72 Use-after-free setting text directionality
  • MFSA 2014-70 Out-of-bounds read in Web Audio audio timeline
  • MFSA 2014-69 Uninitialized memory use during GIF rendering
  • MFSA 2014-68 Use-after-free during DOM interactions with SVG
  • MFSA 2014-67 Miscellaneous memory safety hazards (rv:32.0 / rv:31.1 / rv:24.8)

New in Thunderbird 32.0b1 Beta (Aug 14, 2014)

  • Bug 777574 - Skip all quickCheckAPI tests on linux/android/emulator slaves.
  • Bug 1013007: re-enable STUN throttling in mid-beta and later.
  • Bug 1046500 - Fix mediagroup parsing in feed parser.
  • Bug 1045640 - disable tls proxying bug 378637 on gecko 32.
  • Bug 995075 - Include update_filter() changes from upstream speexdsp.
  • Bug 1032255 - TPS has to exit with code != 0 in case of failures.
  • Bug 1048133 - Check key algorithms before using them for encryption/signatures.
  • Bug 997970 - Add search suggest to Amazon for en-US.

New in Thunderbird 31.0 (Jul 23, 2014)

  • NEW: Auto-completing email addresses now matches against any part of the name or email (bug 529584)
  • NEW: Composing a mail to a newsgroup will now autocomplete newsgroup names (bug 61491)
  • FIXED: Insecure NTLM (pre-NTLMv2) authentication disabled (see 828183)
  • FIXED VULNERABILITIES:
  • MFSA 2014-66 IFRAME sandbox same-origin access through redirect
  • MFSA 2014-65 Certificate parsing broken by non-standard character encoding
  • MFSA 2014-64 Crash in Skia library when scaling high quality images
  • MFSA 2014-63 Use-after-free while when manipulating certificates in the trusted cache
  • MFSA 2014-62 Exploitable WebGL crash with Cesium JavaScript library
  • MFSA 2014-61 Use-after-free with FireOnStateChange event
  • MFSA 2014-59 Use-after-free in DirectWrite font handling
  • MFSA 2014-58 Use-after-free in Web Audio due to incorrect control message ordering
  • MFSA 2014-57 Buffer overflow during Web Audio buffering for playback
  • MFSA 2014-56 Miscellaneous memory safety hazards (rv:31.0 / rv:24.7)

New in Thunderbird 31.0b3 Beta (Jul 16, 2014)

  • Bug 943269 - Minor tweak that might fix the test timeouts.
  • Bug 1023547 - Fix intermittent dom/workers/test/test_promise.html failure.
  • Bug 1028972 - Adjust Breakpad reservation for inflation.
  • Bug 1034327 - Fix memory leak when TURN client is used.
  • Bug 1037464 - Upgrade virtualenv to 1.11.6 because of installation issue [bustage fix].
  • Bug 1018383 - Added request-level caching in NetworkGeolocationProvider.js.
  • Bug 1031414 - Update LZ4.
  • Bug 877661 - Mark mask-html-01-extref-02.xhtml as random on all platforms.
  • Bug 1033703 - Pin TPS to specific versions of mozbase packages.
  • Bug 1030204 - 1/2 Name constraint ANSSI(DCISS) Root cert in mozilla::pkix.
  • Bug 1030204 - 2/2 Tests for Name constraints for ANSSI(DCISS) Root cert in psm.
  • Bug 991776 - Modify the testcase to ensure encoder will receive valid data and add logs for TrackEncoder.

New in Thunderbird 24.6.0 (Jun 11, 2014)

  • Security fixes:
  • MFSA 2014-52 Use-after-free with SMIL Animation Controller
  • MFSA 2014-49 Use-after-free and out of bounds issues found using Address Sanitizer
  • MFSA 2014-48 Miscellaneous memory safety hazards (rv:30.0 / rv:24.6)

New in Thunderbird 30.0b1 Beta (May 10, 2014)

  • Fixed bugs:
  • Bug 1000961 - Make DBusReplyHandler use thread-safe ref-counting.
  • Bug 969372 - Move mediaRecorder in global scope to avoid test timeout.
  • Bug 998302 - Connect to about:config instead of about:credits to avoid accessing mozilla.org when the test runs.
  • Bug 997341 - Modify content/xul/document/test/bug497875-iframe.xul to not connect to mozilla.org.
  • Bug 1004152 - Delay telephony.dial for 1s in test cases.
  • Bug 994907 - imgDecoderObserver does reference counting on different threads, so should be using thread safe reference counting.
  • Bug 983490 - Disable test_browserElement_inproc_SetInputMethodActive.html and test_browserElement_oop_SetInputMethodActive.html for frequent failures.
  • Bug 975550 Handle python 2.6 when preventing invalid utf-8 being writting to test files.
  • Bug 1003250 - Disable automatic sync for TPS tests.
  • Bug 1006298 - TPS fails to download virtualenv due to the redirect.
  • Bug 1005504 - Fix telemetry for application reputation.
  • Bug 900954 - Expose addons.json flush to test harness.

New in Thunderbird 29.0b1 Beta (Apr 25, 2014)

  • Bug 976536 - Fix JSFunction::existingScript returning NULL in some cases.
  • Bug 995995 - Set testing prefs to redirect to the test proxy server for RSS feeds.
  • Bug 996031 - Remove 455407.html crashtest.
  • Bug 996019 - Fix browser_bug435325.js to not connect to example.com.
  • Bug 996009 - Ensure that the richtext2 browserscope tests do not attempt to contact the external network.
  • Bug 997402 - both bing and yahoo params are broken.

New in Thunderbird 24.4.0 (Mar 19, 2014)

  • FIXED: Several fixes to improve handling of BCC when replying to messages (bug 968270, Bug 969358)
  • Security fixes:
  • MFSA 2014-32 Out-of-bounds write through TypedArrayObject after neutering
  • MFSA 2014-31 Out-of-bounds read/write through neutering ArrayBuffer objects
  • MFSA 2014-30 Use-after-free in TypeObject
  • MFSA 2014-29 Privilege escalation using WebIDL-implemented APIs
  • MFSA 2014-28 SVG filters information disclosure through feDisplacementMap
  • MFSA 2014-27 Memory corruption in Cairo during PDF font rendering
  • MFSA 2014-26 Information disclosure through polygon rendering in MathML
  • MFSA 2014-17 Out of bounds read during WAV file decoding
  • MFSA 2014-16 Files extracted during updates are not always read only
  • MFSA 2014-15 Miscellaneous memory safety hazards (rv:28.0 / rv:24.4)

New in Thunderbird 24.3.0 (Feb 5, 2014)

  • FIXED: Improved handling of reply-to (bug 933555)
  • Security fixes:
  • MFSA 2014-13 Inconsistent JavaScript handling of access to Window objects
  • MFSA 2014-12 NSS ticket handling issues
  • MFSA 2014-09 Cross-origin information leak through web workers
  • MFSA 2014-08 Use-after-free with imgRequestProxy and image proccessing
  • MFSA 2014-04 Incorrect use of discarded images by RasterImage
  • MFSA 2014-02 Clone protected content with XBL scopes
  • MFSA 2014-01 Miscellaneous memory safety hazards (rv:27.0 / rv:24.3)

New in Thunderbird 24.2.0 (Dec 11, 2013)

  • Security fixes:
  • MFSA 2013-117: Mis-issued ANSSI/DCSSI certificate
  • MFSA 2013-116: JPEG information leak
  • MFSA 2013-115: GetElementIC typed array stubs can be generated outside observed typesets
  • MFSA 2013-114: Use-after-free in synthetic mouse movement
  • MFSA 2013-113: Trust settings for built-in roots ignored during EV certificate validation
  • MFSA 2013-111: Segmentation violation when replacing ordered list elements
  • MFSA 2013-109: Use-after-free during Table Editing
  • MFSA 2013-108: Use-after-free in event listeners
  • MFSA 2013-104: Miscellaneous memory safety hazards (rv:26.0 / rv:24.2)
  • Other Fixes:
  • Fixed an issue where long messages with multiple signatures could end up unreadable (bug 929006)
  • Fixed an issue where editing account settings was not possible in some non-standard configurations of local folder set-ups (bug 921371)

New in Thunderbird 24.1.1 (Nov 19, 2013)

  • Security fix:
  • MFSA 2013-103: Miscellaneous Network Security Services (NSS) vulnerabilities

New in Thunderbird 24.1.0 (Nov 2, 2013)

  • FIXED: Fixed an issue where signatures were shown in too lighter grey making them difficult to read (bug 917906)
  • FIXED: Fixed an issue where Auto CC for reply might not work if the cc address is the same as the sending address (bug 917231)
  • Security fixes:
  • MFSA 2013-102 Use-after-free in HTML document templates
  • MFSA 2013-101 Memory corruption in workers
  • MFSA 2013-100 Miscellaneous use-after-free issues found through ASAN fuzzing
  • MFSA 2013-98 Use-after-free when updating offline cache
  • MFSA 2013-97 Writing to cycle collected object during image decoding
  • MFSA 2013-96 Improperly initialized memory and overflows in some JavaScript functions
  • MFSA 2013-95 Access violation with XSLT and uninitialized data
  • MFSA 2013-94 Spoofing addressbar though SELECT element
  • MFSA 2013-93 Miscellaneous memory safety hazards (rv:25.0 / rv:24.1 / rv:17.0.10)

New in Thunderbird 24.0 (Oct 11, 2013)

  • NEW: Message threads can now be ignored or watched
  • NEW: Emails can now be sent to IDN based email addresses
  • NEW: Zoom functionality is now available in the compose window
  • CHANGED: In the Compose window, ctrl/cmd + and ctrl/cmd - now change the zoom setting rather than the font size
  • CHANGED: In Twitter, replying to a tweet now replies to all users, just like on the Twitter website
  • FIXED: Interactions in the filter list dialogs have been improved
  • FIXED: In Chat user nicknames are now highlighted when mentioned
  • FIXED: In IRC, long messages will now be sent in multiple parts instead of being cut off
  • Various security fixes:
  • MFSA 2013-92 GC hazard with default compartments and frame chain restoration
  • MFSA 2013-91 User-defined properties on DOM proxies get the wrong "this" object
  • MFSA 2013-90 Memory corruption involving scrolling
  • MFSA 2013-89 Buffer overflow with multi-column, lists, and floats
  • MFSA 2013-88 compartment mismatch re-attaching XBL-backed nodes
  • MFSA 2013-85 Uninitialized data in IonMonkey
  • MFSA 2013-83 Mozilla Updater does not lock MAR file after signature verification
  • MFSA 2013-82 Calling scope for new Javascript objects can lead to memory corruption
  • MFSA 2013-81 Use-after-free with select element
  • MFSA 2013-80 NativeKey continues handling key messages after widget is destroyed
  • MFSA 2013-79 Use-after-free in Animation Manager during stylesheet cloning
  • MFSA 2013-77 Improper state in HTML5 Tree Builder with templates
  • MFSA 2013-76 Miscellaneous memory safety hazards (rv:24.0 / rv:17.0.9)

New in Thunderbird 24.0 (Sep 18, 2013)

  • NEW: Message threads can now be ignored or watched
  • NEW: Emails can now be sent to IDN based email addresses
  • NEW: Zoom functionality is now available in the compose window
  • CHANGED: In the Compose window, ctrl/cmd + and ctrl/cmd - now change the zoom setting rather than the font size
  • CHANGED: In Twitter, replying to a tweet now replies to all users, just like on the Twitter website
  • FIXED: Interactions in the filter list dialogs have been improved
  • FIXED: In Chat user nicknames are now highlighted when mentioned
  • FIXED: In IRC, long messages will now be sent in multiple parts instead of being cut off
  • Various security fixes:
  • MFSA 2013-92 GC hazard with default compartments and frame chain restoration
  • MFSA 2013-91 User-defined properties on DOM proxies get the wrong "this" object
  • MFSA 2013-90 Memory corruption involving scrolling
  • MFSA 2013-89 Buffer overflow with multi-column, lists, and floats
  • MFSA 2013-88 compartment mismatch re-attaching XBL-backed nodes
  • MFSA 2013-85 Uninitialized data in IonMonkey
  • MFSA 2013-83 Mozilla Updater does not lock MAR file after signature verification
  • MFSA 2013-82 Calling scope for new Javascript objects can lead to memory corruption
  • MFSA 2013-81 Use-after-free with select element
  • MFSA 2013-80 NativeKey continues handling key messages after widget is destroyed
  • MFSA 2013-79 Use-after-free in Animation Manager during stylesheet cloning
  • MFSA 2013-77 Improper state in HTML5 Tree Builder with templates
  • MFSA 2013-76 Miscellaneous memory safety hazards (rv:24.0 / rv:17.0.9)

New in Thunderbird 17.0.8 (Aug 7, 2013)

  • Security fixes:
  • MFSA 2013-75 Local Java applets may read contents of local file system
  • MFSA 2013-73 Same-origin bypass with web workers and XMLHttpRequest
  • MFSA 2013-72 Wrong principal used for validating URI for some Javascript components
  • MFSA 2013-71 Further Privilege escalation through Mozilla Updater
  • MFSA 2013-69 CRMF requests allow for code execution and XSS attacks
  • MFSA 2013-68 Document URI misrepresentation and masquerading
  • MFSA 2013-66 Buffer overflow in Mozilla Maintenance Service and Mozilla Updater
  • MFSA 2013-63 Miscellaneous memory safety hazards (rv:23.0 / rv:17.0.8)

New in Thunderbird 17.0.7 (Aug 6, 2013)

  • MFSA 2013-59 XrayWrappers can be bypassed to run user defined methods in a privileged context
  • MFSA 2013-56 PreserveWrapper has inconsistent behavior
  • MFSA 2013-55 SVG filters can lead to information disclosure
  • MFSA 2013-54 Data in the body of XHR HEAD requests leads to CSRF attacks
  • MFSA 2013-53 Execution of unmapped memory through onreadystatechange event
  • MFSA 2013-51 Privileged content access and execution via XBL
  • MFSA 2013-50 Memory corruption found using Address Sanitizer
  • MFSA 2013-49 Miscellaneous memory safety hazards (rv:22.0 / rv:17.0.7)

New in Thunderbird 17.0.6 (Aug 6, 2013)

  • MFSA 2013-48 Memory corruption found using Address Sanitizer
  • MFSA 2013-47 Uninitialized functions in DOMSVGZoomEvent
  • MFSA 2013-46 Use-after-free with video and onresize event
  • MFSA 2013-44 Local privilege escalation through Mozilla Maintenance Service
  • MFSA 2013-42 Privileged access for content level constructor
  • MFSA 2013-41 Miscellaneous memory safety hazards (rv:21.0 / rv:17.0.6)

New in Thunderbird 17.0.5 (Aug 6, 2013)

  • MFSA 2013-40 Out-of-bounds array read in CERT_DecodeCertPackage
  • MFSA 2013-38 Cross-site scripting (XSS) using timed history navigations
  • MFSA 2013-36 Bypass of SOW protections allows cloning of protected nodes
  • MFSA 2013-35 WebGL crash with Mesa graphics driver on Linux
  • MFSA 2013-34 Privilege escalation through Mozilla Updater
  • MFSA 2013-32 Privilege escalation through Mozilla Maintenance Service
  • MFSA 2013-31 Out-of-bounds write in Cairo library
  • MFSA 2013-30 Miscellaneous memory safety hazards (rv:20.0 / rv:17.0.5)

New in Thunderbird 17.0.4 (Mar 11, 2013)

  • Security fixes:
  • MFSA 2013-29: Use-after-free in HTML Editor

New in Thunderbird 17.0.3 (Feb 20, 2013)

  • MFSA 2013-28 Use-after-free, out of bounds read, and buffer overflow issues found using Address Sanitizer
  • MFSA 2013-27 Phishing on HTTPS connection through malicious proxy
  • MFSA 2013-26 Use-after-free in nsImageLoadingContent
  • MFSA 2013-25 Privacy leak in JavaScript Workers
  • MFSA 2013-24 Web content bypass of COW and SOW security wrappers
  • MFSA 2013-23 Wrapped WebIDL objects can be wrapped again
  • MFSA 2013-22 Out-of-bounds read in image rendering
  • MFSA 2013-21 Miscellaneous memory safety hazards (rv:19.0 / rv:17.0.3)
  • FIXED - Attachments sometimes could not be removed from the composition window using the keyboard, this is now fixed

New in Thunderbird 17.0.2 (Jan 9, 2013)

  • FIXED: Pressing the 'x' button on Windows now closes only one window rather than the whole application (805185)
  • FIXED: An issue that caused occasional corruption in local folders after filtering is now fixed (815012)
  • FIXED: An issue that caused deletion of drafts saved in IMAP folders whilst in offline mode is now fixed (805626)
  • Security fixes:
  • MFSA 2013-20 Mis-issued TURKTRUST certificates
  • MFSA 2013-19 Use-after-free in Javascript Proxy objects
  • MFSA 2013-18 Use-after-free in Vibrate
  • MFSA 2013-17 Use-after-free in ListenerManager
  • MFSA 2013-16 Use-after-free in serializeToStream
  • MFSA 2013-15 Privilege escalation through plugin objects
  • MFSA 2013-14 Chrome Object Wrapper (COW) bypass through changing prototype
  • MFSA 2013-13 Memory corruption in XBL with XML bindings containing SVG
  • MFSA 2013-12 Buffer overflow in Javascript string concatenation
  • MFSA 2013-11 Address space layout leaked in XBL objects
  • MFSA 2013-10 Event manipulation in plugin handler to bypass same-origin policy
  • MFSA 2013-09 Compartment mismatch with quickstubs returned values
  • MFSA 2013-08 AutoWrapperChanger fails to keep objects alive during garbage collection
  • MFSA 2013-07 Crash due to handling of SSL on threads
  • MFSA 2013-05 Use-after-free when displaying table with many columns and column groups
  • MFSA 2013-04 URL spoofing in addressbar during page loads
  • MFSA 2013-03 Buffer Overflow in Canvas
  • MFSA 2013-02 Use-after-free and buffer overflow issues found using Address Sanitizer
  • MFSA 2013-01 Miscellaneous memory safety hazards (rv:18.0/ rv:10.0.12 / rv:17.0.2)

New in Thunderbird 16.0.1 (Oct 12, 2012)

  • Added box.com to the list of online storage services that are available for use with Thunderbird Filelink
  • Silent, background updates. Thunderbird will now download and apply updates in the background allowing you to start quickly the next time Thunderbird starts up.
  • Various fixes and performance improvements
  • Various security fixes

New in Thunderbird 16.0 (Oct 10, 2012)

  • NEW: We have now added box.com to the list of online storage services that are available for use with Thunderbird Filelink
  • NEW: Silent, background updates. Thunderbird will now download and apply updates in the background allowing you to start quickly the next time Thunderbird starts up.
  • FIXED: Various fixes and performance improvements
  • FIXED: Various security fixes

New in Thunderbird 13.0.1 (Jun 15, 2012)

  • FIXED: YouSendIt no longer expires Filelinks after 1 week
  • FIXED: The prompt given when a password had changed sometimes referred to a network error rather than a change of password
  • FIXED: Miscellaneous other stability and display updates

New in Thunderbird 13.0 (Jun 6, 2012)

  • NEW:
  • Filelink: Upload your files to an online storage service and send links to your friends, avoiding bounce back due to large attachments. We have partnered with YouSendIt to bring this feature, but additional partners will be added in the near future.
  • NEW:
  • In partnership with Gandi and Hover, you can now sign up for a personalized email address from within Thunderbird. Along with your new email address, Thunderbird will be automatically set up and ready to send and receive messages. We are working with additional suppliers to cover more areas of the world and to provide more options in the future.
  • FIXED:
  • Various security fixes

New in Thunderbird 12.0.1 (Apr 30, 2012)

  • Fix various issues relating to new mail notifications and filtering on POP3 based accounts
  • Fixes an occasional startup crash seen in TB 12.0
  • Fixes an issue with corrupted message bodies when using movemail

New in Thunderbird 12.0 Final (Apr 24, 2012)

  • NEW - Global Search results now include message extracts in the results
  • FIXED - Various security fixes
  • FIXED - Various improvements to RSS feed subscription and general feed handling
  • DEVELPER - Thunderbird now supports add-ons that provide different types of local mail storage

New in Thunderbird 11.0.1 (Mar 28, 2012)

  • Fixed bug in D2D blocklisting check
  • Fixed hang in imap retry url

New in Thunderbird 11.0 (Mar 14, 2012)

  • NEW: New user interface with Tabs above the main menu bar to facilitate navigation and make it more contextual
  • FIXED: Thunderbird notifications may not work properly with Growl 1.3 or later (691662)
  • FIXED: Fixes a crash seen during importing of Microsoft Outlook profiles (723105)

New in Thunderbird 10.0.2 (Feb 17, 2012)

  • Fix a security issue.

New in Thunderbird 10.0.1 (Feb 13, 2012)

  • Several fixes to improve stability.
  • Fixed a security issue: MFSA 2012-10 use after free in nsXBLDocumentInfo::ReadPrototypeBindings.

New in Thunderbird 10.0 (Jan 31, 2012)

  • New ability to search the Web
  • Improvements to email search
  • Several fixes when drafting email
  • and several other platform fixes

New in Thunderbird 9.0 Beta 3 (Dec 1, 2011)

  • Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Thunderbird
  • Better keyboard handling for attachments
  • Several user interface fixes and improvements
  • and numerous other platform fixes

New in Thunderbird 8.0b1 Beta (Oct 5, 2011)

  • Add-ons installed by third party programs are now disabled by default
  • Added a one-time add-on selection dialog to manage previously installed add-ons
  • Improved accessibilty of the attachment lists
  • Several user interface fixes and improvements
  • and numerous other platform fixes

New in Thunderbird 7.0.1 (Oct 1, 2011)

  • Fixed a rare issue where some users could find one or more of their add-ons hidden after a Thunderbird update (see the blog post)

New in Thunderbird 7.0 (Sep 28, 2011)

  • Thunderbird is based on the new Mozilla Gecko 7 engine
  • Several user interface fixes and improvements
  • Several fixes to attachment handling
  • Ability to print a summary of selected email messages
  • Platform improvements to Address Book
  • Fixed several security issues
  • Numerous platform fixes that improve speed, performance and stability

New in Thunderbird 6.0.1 (Aug 31, 2011)

  • Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance

New in Thunderbird 5.0 (Jun 28, 2011)

  • More responsive and faster to start up and use
  • Thunderbird is based on the new Mozilla Gecko 5 engine
  • New Add-ons Manager
  • Revised account creation wizard to improve email setup
  • New Troubleshooting Information page
  • Tabs can now be reordered and dragged to different windows
  • Attachment sizes now displayed along with attachments
  • Plugins can now be loaded in RSS feeds by default
  • There are several theme fixes for Windows Vista and Windows 7
  • Support for Mac 32/64 bit Universal builds (Thunderbird no longer supports PowerPC on Mac)
  • Over 390 platform fixes that improve speed, performance, stability and security

New in Thunderbird 3.1.11 (Jun 22, 2011)

  • Several fixes to improve performance, stability and security

New in Thunderbird 5.0 Beta 1 (Jun 3, 2011)

  • Notable changes in Thunderbird Beta include: a new Addons Manager and Extension management API, Tab enhancements, revised account creation wizard to improve email setup, new troubleshooting infromation page, and several user interface fixes and improvements.
  • New Addons Manager and extension management API (user interface will be changed before final release)
  • Tabs can now be reordered and dragged to different windows
  • Revised account creation wizard, offering improved set-up
  • Attachment sizes now displayed along with attachments
  • New troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
  • Plugins can now be loaded in RSS feeds by default
  • Various other user interface fixes and improvements
  • Support for Mac 32/64 bit Universal builds (Thunderbird Beta will no longer support PowerPC on Mac)
  • and numerous other bug fixes

New in Thunderbird 3.3 Alpha 2 Miramar (Jan 21, 2011)

  • Notable changes in Miramar Alpha 2 from Miramar Alpha 1
  • New Troubleshooting information page to aid supporting and diagnosing problems in Thunderbird
  • Notifications of add-on installation progress and issues now work correctly
  • Attachment reminder now works again
  • Attachment sizes are now available in the compose window
  • and numerous other bug fixes
  • Notable changes in Miramar Alpha 2 when compared to Thunderbird 3.1
  • New Addons Manager and extension management API (user interface will be changed before final release)
  • Attachment sizes now displayed along with attachments
  • Several user interface fixes for Windows Vista/Windows 7
  • Support for Mac 32/64 bit Universal builds ( will no longer support PowerPC on Mac)
  • Over 280 platform fixes to improve performance and stability

New in Thunderbird 3.1.7 / 3.0.11 (Dec 10, 2010)

  • MFSA 2010-78 Add support for OTS font sanitizer
  • MFSA 2010-75 Buffer overflow while line breaking after document.write with long string
  • MFSA 2010-74 Miscellaneous memory safety hazards (rv:1.9.2.13/ 1.9.1.16)

New in Thunderbird 3.3 Alpha 1 Miramar (Nov 24, 2010)

  • New Addons Manager and extension management API (user interface will be changed before final release).
  • Attachment sizes now displayed along with attachments.
  • Several user interface fixes for Windows Vista/Windows 7.
  • Support for Mac 32/64 bit Universal builds (Miramar Alpha 1 will no longer support PowerPC on Mac).
  • Over 190 platform fixes to improve performance and stability.

New in Thunderbird 3.1.6 (Oct 28, 2010)

  • Fixes a critical security issue that could potentially allow remote code execution. This issue does not affect email or newsgroups but could be triggered through browser-like features or add-ons.

New in Thunderbird 3.1.5 (Oct 21, 2010)

  • MFSA 2010-72 Insecure Diffie-Hellman key exchange
  • MFSA 2010-71 Unsafe library loading vulnerabilities
  • MFSA 2010-70 SSL wildcard certificate matching IP addresses
  • MFSA 2010-69 Cross-site information disclosure via modal calls
  • MFSA 2010-67 Dangling pointer vulnerability in LookupGetterOrSetter
  • MFSA 2010-66 Use-after-free error in nsBarProp
  • MFSA 2010-65 Buffer overflow and memory corruption using document.write
  • MFSA 2010-64 Miscellaneous memory safety hazards (rv:1.9.2.11/ 1.9.1.14)
  • Several fixes to improve the user interface and add-ons experience.

New in Thunderbird 3.0.9 (Oct 21, 2010)

  • New Search with Advanced Filtering Tools:
  • New Search with Advanced Filtering Tools: Search results now include advanced filtering tools. You have the option to filter your results by sender, tag, attachments, people, folder, and mailing list. You can also filter your email using the timeline tool.
  • New Global Search Field with Autocomplete: When typing in the Global Search field, Thunderbird autocompletes against your address book. You have the option of searching everywhere or filtering against different parts of the email such as by subject or by sender.
  • User Experience Improvements:
  • New Mail Account Setup Wizard: The new Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Redesigned Mail Toolbar: The Mail Toolbar is redesigned to include the new Global Search bar. Buttons such as reply, forward, delete, junk are part of each email message. You can add those buttons back to the main toolbar by customizing the toolbar.
  • Tabbed Email Messages: Double-clicking or hitting enter on a mail message will now open that message in a New Tab window. Middle-clicking on messages or folders will open them in a Tab in the background. When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.
  • Smart Folders: The folder pane offers a Smart Folders mode which combines special mailboxes, like Inbox, from multiple accounts. Smart Folders is now on by default.
  • New Message Summary View: Selecting multiple messages will give you a summary view of the emails you have selected.
  • Column Headings: The column headings that are displayed and the order in which they are displayed can now be set on a per-folder basis.
  • Message Archive: You can now file messages from your Inbox or other folders into the new Archive folder system.
  • Activity Manager: The Activity Manager records all the interactions between Thunderbird and your email provider in one place.
  • New Add-ons Manager: The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins.
  • Improved Address Book: If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays. You can also add a photo for contacts in your address book.
  • Improved Gmail Integration: Better recognition and integration of Gmail's special folders such as Sent and Trash including non-English versions of Gmail. Thunderbird also uses All Mail as the Archives folder.
  • For Windows Vista users, Thunderbird 3 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.
  • For Mac users, Thunderbird 3 is now integrated with Spotlight, can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.
  • Performance Improvements:
  • IMAP Folder Synchronization: Thunderbird will download IMAP messages by default in the background to allow for faster message loading and better offline operation. This feature can be enabled on an individual folder basis via Folder properties, or for all folders in an account via Account Settings / 'Synchronize & Storage'.

New in Thunderbird 3.1.3 (Sep 8, 2010)

  • Several fixes to improve stability and security, see the Security Advisory.
  • Several fixes to improve stability.
  • Several fixes to the user interface.

New in Thunderbird 3.1.2 (Aug 6, 2010)

  • Several fixes to improve stability.
  • Several fixes to the user interface.

New in Thunderbird 3.1 (Jun 25, 2010)

  • Faster Search Results and Quick Filter Toolbar:
  • Faster Search Results:
  • Message indexing is faster and provides users with faster search results.
  • Quick Filter Toolbar:
  • New Quick Filter Toolbar lets you filter against search terms, tags, starred messages, address book contacts, new emails, and attachments.
  • User Experience Improvements:
  • New Migration Assistant:
  • The new Migration Assistant gives Thunderbird 2 users a way to choose the new features in Thunderbird 3.1 or to keep their current features and settings.
  • Saved Files Manager:
  • New Saved Files Manager displays all the files you downloaded from your email to your computer.
  • Mail Account Setup Wizard:
  • Hundreds of ISP settings have been added to make setting up Thunderbird easier. The Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Performance Improvements:
  • Improvements to Stability, Memory, and Password Handling

New in Thunderbird 3.0.5 (Jun 18, 2010)

  • This release improves the performance of indexing messages and accessing profiles stored on a network.
  • This release also improves the unread email notification on Mac OS X.
  • Several fixes to the user interface.

New in Thunderbird 3.1 RC2 (Jun 9, 2010)

  • Faster Search Results and Quick Filter Toolbar:
  • Faster Search Results - Message indexing is faster and provides users with faster search results.
  • Quick Filter Toolbar - New Quick Filter Toolbar lets you filter against search terms, tags, starred messages, address book contacts, new emails, and attachments.
  • User Experience Improvements:
  • New Migration Assistant - The new Migration Assistant gives Thunderbird 2 users a way to choose the new features in Thunderbird 3.1 or to keep their current features and settings.
  • Saved Files Manager - New Saved Files Manager displays all the files you downloaded from your email to your computer.
  • Mail Account Setup Wizard - Hundreds of ISP settings have been added to make setting up Thunderbird easier. The Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Performance Improvements:
  • Improvements to Stability, Memory, and Password Handling

New in Thunderbird 3.1 RC1 (May 27, 2010)

  • Faster Search Results and Quick Filter Toolbar:
  • Faster Search Results: Message indexing is faster and provides users with faster search results.
  • Quick Filter Toolbar: New Quick Filter Toolbar lets you filter against search terms, tags, starred messages, address book contacts, new emails, and attachments.
  • User Experience Improvements:
  • New Migration Assistant: The new Migration Assistant gives Thunderbird 2 users a way to choose the new features in Thunderbird 3.1 or to keep their current features and settings.
  • Saved Files Manager: New Saved Files Manager displays all the files you downloaded from your email to your computer.
  • Mail Account Setup Wizard: Hundreds of ISP settings have been added to make setting up Thunderbird easier. The Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Performance Improvements:
  • Improvements to Stability, Memory, and Password Handling

New in Thunderbird 3.1 Beta 2 (May 6, 2010)

  • New quick filter toolbar.
  • New migration assistant.
  • Improved support for Personas.
  • Several fixes to improve upgrading from Thunderbird 2.
  • Several design improvements and corrections to the interface.
  • Stability and memory improvements.

New in Thunderbird 3.0.3 (Mar 1, 2010)

  • Fix for missing folders or empty folder pane after updating to Thunderbird 3.0.2

New in Thunderbird 3.1 Alpha 1 (Feb 3, 2010)

  • Several improvements to IMAP.
  • Several fixes for Smart Folders, message filters, and attachment handling.
  • Several design improvements and corrections to the interface.
  • Download Manager is now accessible as a menu item (Tools > Saved Files).
  • Stability and memory improvements.

New in Thunderbird 3.0.1 (Jan 21, 2010)

  • Several fixes to improve stability and security.
  • Several fixes to the user interface and attachment handling.

New in Thunderbird 3.0.0 (Jan 20, 2010)

  • New Search with Advanced Filtering Tools:
  • New Search with Advanced Filtering Tools - Search results now include advanced filtering tools. You have the option to filter your results by sender, tag, attachments, people, folder, and mailing list. You can also filter your email using the timeline tool.
  • New Global Search Field with Autocomplete - When typing in the Global Search field, Thunderbird autocompletes against your address book. You have the option of searching everywhere or filtering against different parts of the email such as by subject or by sender.
  • User Experience Improvements:
  • New Mail Account Setup Wizard - The new Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Redesigned Mail Toolbar - The Mail Toolbar is redesigned to include the new Global Search bar. Buttons such as reply, forward, delete, junk are part of each email message. You can add those buttons back to the main toolbar by customizing the toolbar.
  • Tabbed Email Messages - Double-clicking or hitting enter on a mail message will now open that message in a New Tab window. Middle-clicking on messages or folders will open them in a Tab in the background. When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.
  • Smart Folders - The folder pane offers a Smart Folders mode which combines special mailboxes, like Inbox, from multiple accounts. Smart Folders is now on by default.
  • New Message Summary View - Selecting multiple messages will give you a summary view of the emails you have selected.
  • Column Headings - The column headings that are displayed and the order in which they are displayed can now be set on a per-folder basis.
  • Message Archive - You can now file messages from your Inbox or other folders into the new Archive folder system.
  • Activity Manager - The Activity Manager records all the interactions between Thunderbird and your email provider in one place.
  • New Add-ons Manager - The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins. Note that few Add-ons are compatible with this beta at the time of release, as Add-on developers need to upgrade them.
  • Improved Address Book - If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays. You can also add a photo for contacts in your address book.
  • Improved Gmail Integration - Better recognition and integration of Gmail's special folders such as Sent and Trash including non-English versions of Gmail. Thunderbird also uses All Mail as the Archives folder.
  • For Windows Vista users, Thunderbird 3 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.
  • For Mac users, Thunderbird 3 is now integrated with Spotlight, can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.
  • Performance Improvements:
  • IMAP Folder Synchronization - Thunderbird will download IMAP messages by default in the background to allow for faster message loading and better offline operation. This feature can be enabled on an individual folder basis via Folder properties, or for all folders in an account via Account Settings / 'Synchronize & Storage'.

New in Thunderbird 3.0.0 RC2 (Dec 2, 2009)

  • New Search with Advanced Filtering Tools:
  • New Search with Advanced Filtering Tools - Search results now include advanced filtering tools. You have the option to filter your results by sender, tag, attachments, people, folder, and mailing list. You can also filter your email using the timeline tool.
  • New Global Search Field with Autocomplete - When typing in the Global Search field, Thunderbird autocompletes against your address book. You have the option of searching everywhere or filtering against different parts of the email such as by subject or by sender.
  • User Experience Improvements:
  • New Mail Account Setup Wizard - The new Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Redesigned Mail Toolbar - The Mail Toolbar is redesigned to include the new Global Search bar. Buttons such as reply, forward, delete, junk are part of each email message. You can add those buttons back to the main toolbar by customizing the toolbar.
  • Tabbed Email Messages - Double-clicking or hitting enter on a mail message will now open that message in a New Tab window. Middle-clicking on messages or folders will open them in a Tab in the background. When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.
  • Smart Folders - The folder pane offers a Smart Folders mode which combines special mailboxes, like Inbox, from multiple accounts. Smart Folders is now on by default.
  • New Message Summary View - Selecting multiple messages will give you a summary view of the emails you have selected.
  • Column Headings - The column headings that are displayed and the order in which they are displayed can now be set on a per-folder basis.
  • Message Archive - You can now file messages from your Inbox or other folders into the new Archive folder system.
  • Activity Manager - The Activity Manager records all the interactions between Thunderbird and your email provider in one place.
  • New Add-ons Manager - The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins. Note that few Add-ons are compatible with this beta at the time of release, as Add-on developers need to upgrade them.
  • Improved Address Book - If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays. You can also add a photo for contacts in your address book.
  • Improved Gmail Integration - Better recognition and integration of Gmail's special folders such as Sent and Trash including non-English versions of Gmail. Thunderbird also uses All Mail as the Archives folder.
  • For Windows Vista users, Thunderbird 3 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.
  • For Mac users, Thunderbird 3 is now integrated with Spotlight, can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.
  • Performance Improvements:
  • IMAP Folder Synchronization - Thunderbird will download IMAP messages by default in the background to allow for faster message loading and better offline operation. This feature can be enabled on an individual folder basis via Folder properties, or for all folders in an account via Account Settings / 'Synchronize & Storage'.

New in Thunderbird 3.0.0 RC1 (Nov 25, 2009)

  • New Search with Advanced Filtering Tools:
  • Search results now include advanced filtering tools. You have the option to filter your results by sender, tag, attachments, people, folder, and mailing list. You can also filter your email using the timeline tool.
  • New Global Search Field with Autocomplete
  • When typing in the Global Search field, Thunderbird autocompletes against your address book. You have the option of searching everywhere or filtering against different parts of the email such as by subject or by sender.
  • User Experience Improvements:
  • New Mail Account Setup Wizard - The new Mail Account Setup Wizard matches against a database of email settings from popular mail providers so that you will only need to provide your name, email, and password to set up new mail accounts.
  • Redesigned Mail Toolbar - The Mail Toolbar is redesigned to include the new Global Search bar. Buttons such as reply, forward, delete, junk are part of each email message. You can add those buttons back to the main toolbar by customizing the toolbar.
  • Tabbed Email Messages - Double-clicking or hitting enter on a mail message will now open that message in a New Tab window. Middle-clicking on messages or folders will open them in a Tab in the background. When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.
  • Smart Folders - The folder pane offers a Smart Folders mode which combines special mailboxes, like Inbox, from multiple accounts. Smart Folders is now on by default.
  • New Message Summary View - Selecting multiple messages will give you a summary view of the emails you have selected.
  • Column Headings - The column headings that are displayed and the order in which they are displayed can now be set on a per-folder basis.
  • Message Archive - You can now file messages from your Inbox or other folders into the new Archive folder system.
  • Activity Manager - The Activity Manager records all the interactions between Thunderbird and your email provider in one place.
  • New Add-ons Manager - The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins. Note that few Add-ons are compatible with this beta at the time of release, as Add-on developers need to upgrade them.
  • Improved Address Book - If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays. You can also add a photo for contacts in your address book.
  • Improved Gmail Integration - Better recognition and integration of Gmail's special folders such as Sent and Trash including non-English versions of Gmail. Thunderbird also uses All Mail as the Archives folder.
  • For Windows Vista users, Thunderbird 3 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.
  • For Mac users, Thunderbird 3 is now integrated with Spotlight, can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.
  • Performance Improvements:
  • IMAP Folder Synchronization - Thunderbird will download IMAP messages by default in the background to allow for faster message loading and better offline operation. This feature can be enabled on an individual folder basis via Folder properties, or for all folders in an account via Account Settings / 'Synchronize & Storage'.

New in Thunderbird 2.0.0.23 (Aug 24, 2009)

  • Compromise of SSL-protected communication.

New in Thunderbird 3.0.0 Beta 3 (Jul 23, 2009)

  • Thunderbird 3 Beta 3 is based on the Gecko 1.9.1.1 platform including some major re-architecting to provide improved performance, stability, web compatibility, and code simplification and sustainability.
  • There are over 500 changes in this release, many laying the groundwork for future changes.
  • Developer Improvements:
  • Thread Pane and Tab Refactoring: See Thread Pane UI refactoring discussion for additional details.
  • Fixes For Extension Developers: See Thunderbird Extensions and Thunderbird HowTos for developer documentation.
  • User Experience Improvements:
  • Tabbed Email Messages: Double-clicking or hitting enter on a mail message will now open that message in a New Tab window. Middle-clicking on messages or folders will open them in a Tab in the background. When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a new Tab menu on the Tab toolbar to help you switch between Tabs.
  • New Message Summary View: Selecting multiple messages will give you a summary view of the emails you have selected.
  • Column Headings: The column headings that are displayed and the order in which they are displayed can now be set on a per-folder basis.
  • Smart Folders: The folder pane offers a Smart Folders mode which combines special mailboxes (e.g. Inbox) from multiple accounts together.
  • Improved Gmail Integration: Better recognition and integration of Gmail's special folders such as Sent and Trash including non-English versions of Gmail. Thunderbird also uses All Mail as the Archives folder.

New in Thunderbird 2.0.0.22 (Jun 23, 2009)

  • Crash viewing multipart/alternative message with text/enhanced part.
  • JavaScript chrome privilege escalation.
  • Arbitrary code execution using event listeners attached to an element whose owner document is null.
  • Tampering via non-200 responses to proxy CONNECT requests.
  • Crashes with evidence of memory corruption (rv:1.9.0.11).
  • Same-origin violations when Adobe Flash loaded via view-source: scheme.
  • Crashes with evidence of memory corruption (rv:1.9.0.9).

New in Thunderbird 3.0.0 Beta 2 (Feb 26, 2009)

  • User Experience Improvements:
  • Message Archive:
  • You can now file messages from your Inbox or other folders into the new Archive folder system.
  • Activity Manager:
  • The Activity Manager records all the interactions between Thunderbird and your email provider in one place.
  • Performance improvements:
  • Faster Message Loading for IMAP:
  • Thunderbird will now download IMAP messages by default in the background to allow for faster message loading, and better offline operation. This feature can be enabled on an individual folder basis (via folder properties), or for all folders in an account, via Account Settings / Sync & Disk Space.

New in Thunderbird 2.0.0.19 (Jan 2, 2009)

  • XSS and JavaScript privilege escalation.
  • Escaped null characters ignored by CSS parser.
  • Errors parsing URLs with leading whitespace and control characters.
  • Cross-domain data theft via script redirect error message.
  • XMLHttpRequest 302 response disclosure.
  • Information stealing via loadBindingDocument.
  • Crashes with evidence of memory corruption (rv:1.9.0.5/1.8.1.19).

New in Thunderbird 3.0.0 Beta 1 (Dec 10, 2008)

  • User Experience Improvements:
  • Tabbed Email: Email messages, folders, and calendars (with the Lightning extension installed) can be opened in tabs.
  • Improved Message Reader View: This is the first stage of a series of refinements to the message reading experience. The first stage brings email controls closer to the area in which the user is operating.
  • New Add-ons Manager: The new Add-ons Manager (Tools > Add-ons) can now be used to find, download, and install Thunderbird Add-ons which includes Extensions, Themes, and Plugins. Note that few Add-ons are compatible with this beta at the time of release, as Add-on developers need to upgrade them.
  • Improved Address Book: If someone is in your address book, it is indicated by a new star icon which you can click to edit contact details inline. If they are not in your address book, you can add them with one click of the icon. A new birthday field allows you to keep track of your friends' birthdays.
  • For Windows Vista users, Thunderbird 3 Beta 1 is now integrated with Vista search results. On first start, Thunderbird will prompt to install its indexing system into Windows Vista and you can choose to see Thunderbird email and news messages in Windows search results.
  • For Mac users, Thunderbird 3 Beta 1 can import from Mail.app, read your OS X address book, and use Growl for new mail alerts.
  • Performance improvements:
  • Faster Message Loading for IMAP: Thunderbird will now download IMAP messages in the background to allow for faster message loading, and better offline operation. This feature can be enabled on an individual folder basis (via folder properties), or for all folders in an account, via Account Settings / Sync & Disk Space.

New in Thunderbird 2.0.0.18 (Nov 20, 2008)

  • MFSA 2008-59 Script access to .documentURI and .textContent in mail
  • MFSA 2008-58 Parsing error in E4X default namespace
  • MFSA 2008-56 nsXMLHttpRequest::NotifyEventListeners() same-origin violation
  • MFSA 2008-55 Crash and remote code execution in nsFrameManager
  • MFSA 2008-52 Crashes with evidence of memory corruption (rv:1.9.0.4/1.8.1.18)
  • MFSA 2008-50 Crash and remote code execution via __proto__ tampering
  • MFSA 2008-48 Image stealing via canvas and HTTP redirect

New in Thunderbird 2.0.0.17 (Sep 26, 2008)

  • MFSA 2008-46 Heap overflow when canceling newsgroup message
  • MFSA 2008-44 resource: traversal vulnerabilities
  • MFSA 2008-43 BOM characters stripped from JavaScript before execution
  • MFSA 2008-42 Crashes with evidence of memory corruption (rv:1.9.0.2/1.8.1.17)
  • MFSA 2008-41 Privilege escalation via XPCnativeWrapper pollution
  • MFSA 2008-38 nsXMLDocument::OnChannelRedirect() same-origin violation
  • MFSA 2008-37 UTF-8 URL stack buffer overflow

New in Thunderbird 2.0.0.16 (Sep 1, 2008)

  • The following security issues have been fixed:
  • MFSA 2008-34 Remote code execution by overflowing CSS reference counter
  • MFSA 2008-33 Crash and remote code execution in block reflow
  • MFSA 2008-31 Peer-trusted certs can use alt names to spoof
  • MFSA 2008-29 Faulty .properties file results in uninitialized memory being used
  • MFSA 2008-26 Buffer length checks in MIME processing
  • MFSA 2008-25 Arbitrary code execution in mozIJSSubScriptLoader.loadSubScript()
  • MFSA 2008-24 Chrome script loading from fastload file
  • MFSA 2008-21 Crashes with evidence of memory corruption (rv:1.8.1.15)

New in Thunderbird 2.0.0.14 (May 6, 2008)

  • Fixed security issues
  • Fix: Crashes with evidence of memory corruption (rv:1.8.1.13)
  • Fix: JavaScript privilege escalation and arbitrary code execution

New in Thunderbird 2.0.0.12 (Feb 27, 2008)

  • MFSA 2008-12 Heap buffer overflow in external MIME bodies
  • MFSA 2008-07 Possible information disclosure in BMP decoder
  • MFSA 2008-05 Directory traversal via chrome: URI
  • MFSA 2008-03 Privilege escalation, XSS, Remote Code Execution
  • MFSA 2008-01 Crashes with evidence of memory corruption (rv:1.8.1.12)