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ImportExportTools
Requires Restart
Adds some tools to import and export folders and messages
Provider for Google Calendar
Enigmail
Helper tool to migrate your keys and important settings from Enigmail to Thunderbird 78.
British English Dictionary (Marco Pinto)
A fork of Mark Tyndall's add-on, based on David Bartlett's
British Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey.
V3.3.1 has 140 000+ new words and also fixes.
FlashGot Mass Downloader
Requires Restart
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
Auto Resize Image
Requires Restart
Resizer for inline and attachment images (JPEG, PNG, BMP and GIF image formats).
All platforms are supported (Windows, Linux and Macintosh).
English United States Dictionary
English United States (en-US) Dictionary as shipped with Thunderbird 115 ESR and Firefox 115 ESR.
French spelling dictionary
German Dictionary
German Dictionary (new Orthography) for spellchecking in Mozilla products
Spanish (Spain) Dictionary
CardBook
Featured
A new Thunderbird address book based on the CardDAV and vCard standards.
Twitter: @CardBookAddon
TT DeepDark
Manually sort folders
This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.
Saved Password Editor
Requires Restart
Adds the ability to create and edit entries in the password manager.
gContactSync
Requires Restart
Synchronizes contacts & groups between Thunderbird and Google Contacts.
ExQuilla for Exchange
Thunderbird email accounts connecting to Microsoft Exchange Web Services.
Theme Font & Size Changer (fixed)
Fixed version (no 90 day timer till silent failure) of the popular "Theme Font & Size Changer for Thunderbird" addon
SQLite Manager
Brazilian Portuguese Dictionary (New Spelling)
The same spellchecker shipped with the Brazilian version of Firefox.
To create your own collections, you must have a Mozilla Add-ons account.
