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.
Addon ID is now in a tooltip for the versions label.
Fixed preferences window title.
Compatibility is still displayed in the newer versions, but due to changes in the new Addons programming interfaces, checking for compatibility updates has been removed.
This addon does NOT work with Thunderbird 3.3 or Firefox 4.0, since they completely redid the addons manager for these versions. I might look into updating the addon for these, but I make no guarantees.