Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
FEATURE: Support for Thunderbird was restored, although not all functionality is available.
FIX: Context menu items are now created only when menu's are shown (this also prevents the failure of XUL overlays).
FIX: Start-up is now more reliable, for example when quickly opening multiple windows.
FIX: A mistake in a condition testing for the number of windows during start-up was fixed.
FIX: Target positions are now stored on windows rather than globally to prevent conflicts, e.g. during start up.
FIX: The panel background was made transparent to prevent a paint bug with 100% CPU upon resizing off-screen.
FIX: A pinned panel is now prevented from moving after the window position changes.
FIX: The "exit" message is now sent to all remote content frames and not only to all tabs.
FIX: The outdated extension preferences branch is now removed directly after upgrading (and no more after uninstallation).
This add-on is not compatible with your version of Firefox because of the following: