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.
FileLink provider for WebDAV Featured
Uploads your large attachments to your WebDAV account instead of sending them by email.
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.
ImportExportTools Requires Restart
Adds some tools to import and export folders and messages
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.
Display Mail User Agent T Featured
Displays the mail program with which the selected mail was written
*This addon is compatible with Thunderbird after Web Extesnsions support. Since development and operation check are done on Daily, it may not work on normal Thunderbird.
Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.
Display Quota Requires Restart
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...
Unofficial DeepL translate extension for Thunderbird.
LightningButton Requires Restart
Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.
Adds a button to open Google Keep in a new Tab
Mail Redirect Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
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.
IMAP Quota (Free Space) Requires Restart
This Thunderbird addon lets you customize the IMAP quota statusbar panel.
Beautifully visualized statistics for your Thunderbird Email Accounts
Adds options to launch other profiles.
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.
Add Signature Requires Restart
Simply add your signature manually (right mouse click) to your emails