I removed Unity from my system (Ubuntu 13.04), however, there is a remaining file located in Thunderbird Extensions, which is "Messaging Menu and Unity Launcher integration". I searched for the file in Synaptic, but I didn't find it.
My question is: What is the name of the package?
This extension is included in Thunderbird's package itself. You would need to run:
sudo rm /usr/lib/thunderbird-addons/extensions/messagingmenu@mozilla.com.xpi
This will remove the extension's installer. When you do so it should (in theory) allow you to remove it from your Thunderbird profile.
