Most Popular Extensions
Sender Verification Anti-Phishing Extension Requires Restart
Protects you from phishing attacks by verifying the From: address domain name of emails as you read them. Sender Policy Framework (SPF) and DNS-based reputation lists are used.
NirvanaHQ Requires Restart
NirvanaHQ for Thunderbird
Force Authentication at Startup. Requires Restart
Always ask password and hide UI at the startup.
Mukparasi Korean-English Dictionary File Requires Restart
A Korean-English dictionary file for Mukparasi.
Submit Word (Romanian) Requires Restart
An extention that allows users to submit words for inclusion in the Romanian dictionary.
Mailopen Requires Restart
Open an email file from the commandline
Habu Requires Restart
*This extension was formerly known as Okopipi*
Please be sure to visit the homepage and forums to provide your input for the future of Habu.
Support can be found at http://forums.mosinu.com/viewforum.php?f=5
Headers Toggle Requires Restart
Gives Thunderbird a keyboard shortcut (H) to change how headers are displayed.
This extension will remember the last dictionary used in the Mail Compose window and use it when composing new messages.
Open google instantly with this super fast add on.And its just < 10KB.!
No need to type google in your address bar anymore.Just try this awesome to open up google instantly.
Don't Send Linked Files Requires Restart
Prevents sending of linked files if they are file: URLs.
Datodo Requires Restart
La gestion de tâches, simple et rapide.
PassToScript extension Requires Restart
Extension to pass e-mail in eml (raw) format directly to the script specified
ThunderBridge Requires Restart
P2P e-mail delivery.
DSN Settings Requires Restart
Adds user interface settings for Delivery Status Notification (DSN) requests. This addon is usefull for settings for Delivery Notification request and better experience with Notification Viewer addon.
XML Digital Signature Tool Requires Restart
XML Digital Signature Tool is a Firefox add-on for processing Digital Signature in XML documents
(Please read the installation instruction in the "Developer Comments" section before downloading)
Options Toolbar Button Requires Restart
Display mailing list header Requires Restart
This extension implements RFC 2369 for Thunderbird: Special mailing list header fields in the mail are parsed, and the links are displayed in the extended header view. You can click them to simply go to the archive, request help or unsubscribe.
PONG! Multiplayer Requires Restart
Play a game of PONG! while you are waiting.
Open Long Url Requires Restart
Adds an option to your File menu to allow you to open long, multi-line...