.vcs Support Requires Restart
Import and export calendar files in vCalendar (.vcs) format
Translation Panel Requires Restart
Add Web Translation Features.
Remove Duplicate Messages (Alternate) Requires Restart
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
FG Printers Requires Restart
This extension allows you to modify the printing output of Mozilla Calendar. You can change the font, font-sizes and display of colors. Plus category colors are actually printed and end date calculation now works!
Growl Notifications Requires Restart
Official Growl project to integrate it with the Mozilla code base.
Provider for Google Calendar Requires Restart
Allows bidirectional access to Google Calendar
Lightning Nightly Updater (Unofficial) Requires Restart
Quickly get to the latest nightly build of Lightning relevant to the version of Thunderbird and the OS you're on.
Disable DragAndDrop (Thunderbird) Requires Restart
A Thunderbird extension which disables drag and drop in the folder pane.
This extension prevents unintended folder movement.
Compact Menu 2 Requires Restart
Add a compact menu button to the navigation toolbar, and hide the menu bar.
Viral Threat Level Requires Restart
Adds an image to the status bar indicating the current threat level of the internet. It allows quick access to security information that you can use to help protect yourself, and links to antivirus software comparisons and security extensions.
Keyword Highlight Requires Restart
Keywordhighlight changes color/size/weight of your favorite keywords...
Thunderled Requires Restart
For ASUS laptop owners, each time a new email is in your inbox, the email led will switch on...
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)
Account Manager Toolbar Button Requires Restart
Print Preview Toolbar Button Requires Restart
Options Toolbar Button Requires Restart
Alphanumerator Requires Restart
Convert alphanumeric phone numbers to just numbers. Simply highlight the text, right-click it, and click "Alphanumerate". For example, 1-800-PICK-UPS would be converted to...
Key Manager Requires Restart
KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation
Priority Switcher Requires Restart
Change priority of the received messages from the toolbar button and the context menus...
LookOut Requires Restart
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).