Message Composition

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Textmarker

Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)

Rated 5 out of 5 stars (36)
45,260 users
Updated May 14, 2025

ThunderAI (ChatGPT, Gemini, Ollama in your emails)

ThunderAI uses the capabilities of ChatGPT, Google Gemini or Ollama to enhance email management.
It enables users to analyze, write, correct, assign tags, create calendar events and tasks and optimize their emails.

Rated 5 out of 5 stars (17)
5,238 users
Updated May 13, 2025

Owl for Exchange

Allows you to use your Exchange and Office365 email account with Thunderbird using Outlook Web Access (OWA).

Rated 5 out of 5 stars (214)
48,489 users
Updated May 12, 2025

ThunderAI Sparks

ThunderAI Sparks is an add-on designed to add advanced features to ThunderAI.

Not yet rated
301 users
Updated May 8, 2025

Inbox Actions

Inbox Actions add convenient interactions to messages allowing users to interact with an product or service all without the user even having to open their email.

Not yet rated
2 users
Updated May 8, 2025

Automatic Dictionary

Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.

Rated 5 out of 5 stars (49)
3,602 users
Updated May 6, 2025

Auto Capitalize Mail

Capitalizza automaticamente il testo nelle email.

Not yet rated
1 user
Updated May 5, 2025

SmartTemplates Featured

SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.

Rated 4 out of 5 stars (81)
4,015 users
Updated May 5, 2025

AI Mail Support

Add-on designed to enhance email management for both personal and professional use, integrating a set of adanced AI (LLM) features to optimize the email management experience.

Rated 5 out of 5 stars (1)
287 users
Updated May 4, 2025

FlexConfirmMail

Confirm mail address and attachments based on flexible rules.

This edition will have incompatible changes. Another edition for enterprise users with less changes:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail-stable/

Not yet rated
41 users
Updated May 3, 2025

Search Selector

Плагин для выбора поисковой системы при поиске выделенного текста.

Not yet rated
2 users
Updated April 30, 2025

Clippings for Thunderbird

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (8)
1,862 users
Updated April 30, 2025

Quicktext Community Scripts

A set of Quicktext scripts maintained by the community

Not yet rated
14 users
Updated April 28, 2025

changeQuote

It's an extension that changes the format of reply header.
You can choose between the standard Thunderbird reply header, a detailed reply header or a Customized reply header.
You can configure it in the Tools ->Add-on Preferences -> changeQuote.

Rated 4 out of 5 stars (27)
1,886 users
Updated April 16, 2025

Folder Account

Lets you associate user accounts and identities with specific folders. Great for multiple users who share TB, or for managing mailing lists.

Rated 4 out of 5 stars (64)
2,202 users
Updated April 14, 2025

*cloud - FileLink for Nextcloud and ownCloud Featured

Upload large attachments to your Cloud and send the link by email

Rated 5 out of 5 stars (55)
37,990 users
Updated April 13, 2025

Grammar, Proofreading & Spell Checker

Check the grammar and spelling directly inside Thunderbird using Wordeep technology

Rated 4 out of 5 stars (4)
698 users
Updated April 7, 2025

Thunderbird-CloudLink

Inserting file link to mail with optional password and expiration date

Not yet rated
15 users
Updated April 7, 2025

Attach from Clipboard

Create file attachments directly from the system clipboard.

Rated 4 out of 5 stars (32)
6,213 users
Updated March 29, 2025

StandardTexter

With the help of this Add-on, up to 99 pre-made texts (standard texts, text modules or even signatures) can be stored, which can then be retrieved and inserted when writing an e-mail.
The texts can be preformatted with HTML.

Rated 4 out of 5 stars (15)
2,312 users
Updated March 29, 2025