Allows bidirectional access to Google Calendar
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
Adds some tools to import and export folders and messages
DOM Inspector 需要重开
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.
Display Quota 需要重开
This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...
Mail Redirect 需要重开
Adds some options to print messages and addressbooks
Add-on has now been discontinued, see below.
Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Uploads your large attachments to your WebDAV account instead of sending them by email.
Minimizes windows into the system tray.
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.
Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.
Calendar Tweaks 需要重开
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.
Google Keep for Thunderbird
Auto Compress File 需要重开
Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).
Moves the toolbar back above the tabbar.
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.