Empty Trash Button
Thunderbird as a safety measure sends all deleted messages to the Trash folder. This can soon become quite large, epically if you get lots of spam. Emptying it and getting rid of all that useless junk becomes an often repeated task. This convenient and easy to use button can do it for you.
Delete Junk Button
Empty the junk email folder of all junk email.
Send & Receive Button
Send all messages in the outbox and get all new messages
Purge Button
Delete all junk emails then compact all folders. Quick way to do both at the same time.
Return Receipt Button
Toggle the sending of a return receipt on and off
Compact Button
Compact all Folders
Plain Text Paste Button
Paste text into Thunderbird's compose window with out any formating.
Install Button
Installing Extensions and particularly themes that you have downloaded can be quite a trick. This button makes the process simple and hassle free.
Add-ons Button
This being the most downloaded button I have made speaks for itself. The add-on's window allows the installation and management of all your extensions and themes. If you need an update, change a setting, swap themes or enable/disable an add-on the Add-ons' window is the black to go. Being able to access this quickly is a necisity for many.
Status Bar Button
Toggle the status bar from hidden to shown. Hide it to get the most out of your screen space, and show it when it's really needed.