Auto Save Drafts Folders Requires Restart
Allows auto saved drafts to be stored in a separate folder from purposely saved drafts.
Thunderbird 31: Use v0.3.0b1 from https://addons.mozilla.org/en-US/thunderbird/addon/auto-save-drafts-folders/versions/
Auto Compress File Requires Restart
Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).
Add-on Update Checker Requires Restart
Adds Tools menu item to check Add-ons for updates. Includes toolbar icon.
Restart the current application, as you might need to do after installing a new extension or theme.
GlodaQuilla search indexing enhancements Requires Restart
Permits selective enabling and disabling of search indexing on folders or accounts - with inheritence. Also adds three columns to the Thunderbird message pane that are useful in debugging.
Filter Uploader for Adblock Plus (unofficial) Requires Restart
DOES NOT BLOCK ADS! Don't install this add-on if you don't know what 'uploading' means!
This add-on Uploads the filters from your Adblock Plus installation to a FTP, HTTP, HTTPS server...
Restart application Requires Restart
Restart the application with one click (or Ctrl Shift Z)
PrintingTools Requires Restart
Adds some options to print messages and addressbooks
SQLite Manager Requires Restart
Manage any SQLite database on your computer.
MinimizeToTray Requires Restart
Minimizes Mozilla windows into the system tray. Also includes a right clickable tray icon menu to further load only the windows you want visible...
Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.
Quicktext Requires Restart
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
ProfileSwitcher Requires Restart
It adds some options to launch easily other profiles and the Profile Manager.
Moves Edit > Preferences to Tools > Options…
Lightning Month Tabs Requires Restart
This addon adds month tabs into Lightning calendar month view
Muttator Requires Restart
Make Thunderbird behave like Vim
Hide Menubar Requires Restart
Supports to hide Menu Bar automatically, you can press the ALT key to show it temporarily.
Check for Updates in Help Menu Requires Restart
Adds a 'Check for Updates' entry to the Help menu.
Keyfixer Requires Restart
(Note: Version 0.5.34 has been updated to work with Firefox 34)
Keyfixer patches the key bindings for Mac OS X users of Firefox and Thunderbird to match the key bindings of Windows
Is It Compatible? Requires Restart
**Notice: This addon is no longer maintained.** Are your addons compatible with the next version of Firefox? Find out straight from the Addons window! **Version 0.6.0 is available from the Versions page, it was never approved by AMO**