Most Popular Extensions
Spoof Detector Requires Restart
Extension for Email Spoofing Detection
Open Addons Requires Restart
Open Add-ons window with one click.
Lightning Multiweek View Requires Restart
Adds a multiweek view to...
manoderecha Requires Restart
Assists to setup a chat account for manoderecha
Mark Read On Reply Requires Restart
A simple extension to mark messages read after you click a reply menu or button (or Ctrl+R)
After Unsent Mail Is Sent Requires Restart
Run a program of your choice after unsent mail has been sent.
Sets the spell check dictionary based on the first recipient
FlatStyle for Thunderbird Requires Restart
This gives you a style similar to MS Office XP in your Thunderbird menus and toolbars, and Calendar as well if you have that installed. It also changes the category-selector in the options window to use your system colors, instead of always being...
World Weather Requires Restart
Display local weather information from around the...
Lovebird Requires Restart
Email organized around the people you care about.
DictsInfo Requires Restart
Search the highlighted text at Dicts.info.
privateID Requires Restart
This extension displays a warning if you send a message from your private emailID to an address/ mailing list which is not found in your Personal Address Book...
Edit HTML Source Requires Restart
You can now edit the HTML source in the Compose...
pass-manager Requires Restart
Replace integrated password managers storage with zx2c4's pass (www.passwordstore.org)
Shift Box Requires Restart
Replay your INBOX!
PONG! Multiplayer Requires Restart
Play a game of PONG! while you are waiting.
Check Attachment before Send Requires Restart
Confirms to send a mail with any attachment.
Seturgent Requires Restart
Sets the urgent flag (X11) of the Thunderbird window under Linux in case of new messages. Does ignore special folders like Drafts, Junk and such.
NetscapeCommunicator 4.x Account Settings Migrator Requires Restart
Provies ability to migrates account settings and preferences from NC4.x profiles.