Miscellaneous
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LightningButton Requires Restart
Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.
Add Signature Requires Restart
Simply add your signature manually (right mouse click) to your emails
JavaScript Debugger Requires Restart
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.
FileLink provider for WebDAV Featured
Uploads your large attachments to your WebDAV account instead of sending them by email.
FiltaQuilla
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
Calendar Tweaks Requires Restart
Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.
URL Link
URL Link is a small Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.
Mail Redirect Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
DOM Inspector Requires Restart
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
Quicktext
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
SendTools Requires Restart
Add SendAt option to the compose window to allow sending a message on a particular date and...
Yandex Mail - Quick Access
Quick Access to Yandex.Mail in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Google Calendar Tab Requires Restart
Adds the Google Calendar web interface as a new tab directly into Thunderbird. Creating and viewing events works just as it would in a browser like Firefox
Evolution Mirror Requires Restart
Mirrors calendars to Evolution Database Server to allow them to be viewed through the gnome clock applet
To create your own collections, you must have a Mozilla Add-ons account.