The Desktop extension, besides the fact that it offers you a quick method to change your background image also provides you full control on the images layout.
The Desktop add-on is cross-platform and it works on Mac OS X, Windows and Linux.
Here are some key features of "Desktop":
· Add thumbnails to new tabs
· Align them by drag&drop
· Create sub-folders
· Sync layout using extensions like XMarks or Weave
· Firefox 3.0 and later
What's New in This Release: [ read full changelog ]
· Temporary fix for Firefox 22 and later. No favicons will be displayed for now.