Lovebird Requires Restart
Email organized around the people you care about.
random(signature) Requires Restart
Updates a given signature file in regular intervals.
SmilieInserter Plus Requires Restart
Insert smilies in messages.
FastCC Requires Restart
A Thunderbird extension that let you switch to cc: with the ALT+CTRL+C keyboard shortcut!
Get before Send Requires Restart
Get messages for the account which is bound to the identity then send the message when you click the toolbar button or the menu item. If your SMTP sever authenticates using POP(IMAP) before SMTP, the extension is useful.