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.
FIX: Context menu items are now created only when a menu is shown (this also prevents the XUL overlay from failing).
FIX: The panel background was made transparent to prevent a paint bug with 100% CPU upon resize.
FIX: The outdated extension preferences branch is now removed directly after upgrading (and no more after uninstallation).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 Thunderbird because of the following: