Add-ons
Miscellaneous
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Provider for Google Calendar
Provider for Google Calendar connects Thunderbird with Google Calendar for full task sync, conference details, and scheduling support. It offers deeper integration than Thunderbird’s native support using Google’s official API.
Quicktext
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.
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.
DeepL Selected Text
Display Mail User Agent T
Featured
Add-on for Thunderbird that displays information about the mail user agent (i.e. email software) with which the selected mail was composed.
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
ThirdStats
Google Keep Tab
Header Tools Improved
Google Calendar - Quick Access
Quick Access to Google Calendar in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Profile Switcher
Open Tab
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...
LightningButton
Requires Restart
Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.
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.
Open Google TasksTo create your own collections, you must have a Mozilla Add-ons account.
