Most Popular Extensions
Planteen Host Email Requires Restart
This is the official quick access link for Planteen Host Email. Plenty of FREE extras! Business and Corporate class email. Use your own domain, reliable, secure and access from any device.
Follow Broken Lotus Notes Links Requires Restart
Fixes the HREF on MASFLOW links in emails from Lotus Notes.
If you dont know what that is you do not need this.
BOINC Stats 2 Requires Restart
Displays your Total and Recent Average Credits for BOINC distributed computing projects in the status bar.
Custom Alarms Requires Restart
Customize the reminder dropdown in Sunbird and Lightning's event and task dialog.
To configure this extension, open the addon preferences from the addons manager.
S/MIME Security for Multiple Identities Requires Restart
Adds S/MIME Security configuration to the multiple identities dialog.
Meanwhile this feater has been integrated into Thunderbird 3
Path Linker Requires Restart
rmIncomingDups Requires Restart
rmIncomingDups is a Thunderbird extension that checks if there are duplicate messages across accounts.
When a new mail arrives rmIncomingDups checks according to the rules configured if it finds some duplicates and removes them.
IO.Translator Requires Restart
即时在线汉英互译 - Instant Online Translator (Chinese-English)
Color Source Requires Restart
Add syntax highlighting of code in various languages to email messages via context menu.
Don't Forget CC Requires Restart
Dialectic Dialer Requires Restart
Dial phone numbers with Dialectic (Dialectic is for OS X only). In addition, when a page loads, phone numbers can optionally be highlighted and hyperlinked to dial Dialectic.
arXiv Requires Restart
Adds direct links to the article PDF and BibTeX information to arXiv email listings. BibTeX information can be used in reference managers such as JabRef by Copy & Paste.
Options Toolbar Button Requires Restart
Reject Button 1.0 Requires Restart
Annoyed by receiving mails with missing or wrong subjects or meaningless message bodies? Simply reject them with the Reject Button Add-On and enforce proper e-mail etiquette at the cost of just a few friendships.
Scans hyperlinks in composed messages and alerts if one of the hyperlinks is broken.
Hide Clear List Button Requires Restart
Hide the "Clear List" Button in the Download Manager.
Mail Size Report Requires Restart
Report current size of mail with attachment files in status bar
Cat Attack Quick Button Requires Restart
Easily visit the site for The Cat Attack Fishing Tournament.
Indian Language Transliterator Requires Restart
Indian Language Transliterator (developed at IIIT Hyderabad, India) is a Mozilla Thunderbird Add-on, developed to enable Thunderbird users to compose and send messages in 10 Regional Indian Languages, using their regular QWERTY keyboard!!!