Tube Controller is a free and menu bar based OS X application which will allow you to use the media keys on your keyboard to control YouTube.
Tube Controller will help you play/pause the current video and rewind/fast forward when needed.
NOTE: To buy Tube Controller via the App Store, an Apple account is required.
Here are some key features of "Tube Controller":
· Compatible with both Safari and Google Chrome
· Runs in the background
· Play/pause keyboard keys
· Rewind/fast forward keyboard keys
· Operates from the top menu status bar
· Quick launch YouTube menu item
· Doesn't disrupt iTunes or Quicktime
· Launch Tube Controller at log in
· Disables computer from sleeping when YouTube is playing
· 64-bit processor