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ImportExportTools NG
Adds tools to import/export messages and folders
Thunderbird v115 Support Available !
German Dictionary
German Dictionary (new Orthography) for spellchecking in Mozilla products
Provider for Google Calendar
LookOut (fix version)
LookOut decodes winmail.dat (TNEF encoded) files that may come from a misconfigured Microsoft Exchange server or Outlook user allowing access to the original attachments
Support: Thunderbird
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.
V3.3.2 has 140 000+ new words and also fixes.
Quicktext
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
French spelling dictionary
Send Later
Remove Duplicate Messages
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
TbSync
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
CardBook
Featured
A new Thunderbird address book based on the CardDAV and vCard standards.
Twitter: @CardBookAddon
English United States Dictionary
English United States (en-US) Dictionary as shipped with Thunderbird 115 ESR and Firefox 115 ESR.
Mail Merge
Create and Save or Send Multiple Individual and Personalized Messages from a Draft
Spanish (Spain) DictionaryTo create your own collections, you must have a Mozilla Add-ons account.
