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ShowContactFoto

Displays the contact photo/image/picture of the sender/recipients while reading/composing message.
Images are taken from local image files or Address Book (see addon's options page).

Rated 4 out of 5 stars (3)
40 users

MROF (Move Rep. Original Folder)

Tired of having to hunt down which folder you filed a thread in after doing it 20 times? MROF does it for you!

Not yet rated
15 users

Advanced Sound Filters Pro

Play custom sounds for emails matching advanced filters with enhanced UI.

Professional email sound notification system for Thunderbird with advanced filtering capabilities.

Not yet rated
15 users

ThundAi Q/A - Ask your email Questions

AI-powered email search and question answering for Thunderbird. Search your emails with natural language questions. Use a ? to ask questions, otherwise it will default to search by keyword sorted most recent first.

Requires an OpenAI API key!

Not yet rated
3 users

Mail-Bilder Verkleinere

Komprimiert Bildanhänge im Verfassen-Fenster mit nur einem Klick: große Fotos werden automatisch verkleinert und durch kleinere ersetzt. Spart Platz und verhindert übergroße E-Mails.

Rated 5 out of 5 stars (2)
66 users

ThunderAI (ChatGPT, Gemini, Ollama in your emails)

ThunderAI uses the capabilities of ChatGPT, Google Gemini, Claude 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 (21)
7,040 users

Antidote connector for Thunderbird

Integrate Antidote with Thunderbird to proofread your emails, check your spelling and grammar, and consult the dictionaries and language guides. Get alerted to abrasive tone and missing attachments before sending a message.

Rated 3 out of 5 stars (2)
1,249 users

Mark Subfolders Read

Adds a context option to folders for marking all contents of the selected folder and all subfolders as read.

Rated 4 out of 5 stars (3)
146 users

Zulip - Quick Access

Quick Access to Zulip in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Not yet rated
2 users

Webpage Opener

Adds a button to the toolbar to open a user defined webpage.

Rated 5 out of 5 stars (1)
39 users

Thunderbird Send [stage]

[Alpha Testing] Thunderbird send allows sending and receiving end to end encrypted files.

This add-on is undergoing testing and not yet available to the general public.

Rated 1 out of 5 stars (1)
29 users

Antispam

Sending email to the Antispam database

Not yet rated
33 users

AutoZoom

AddOn to save a text zoom for eMail text editor.

Rated 4 out of 5 stars (4)
203 users

SimpleLogin - Easy Reach

An extension for Thunderbird that allows you to access SimpleLogin.

Not yet rated
20 users

OWUI - Quick Access

This extension adds a simple button to your Spaces toolbar that opens in a new tab, providing you with one-click access to your Open WebUI Instance.

Not yet rated
5 users

Gemini Proofreader

This extension uses Gemini Flash 2.5 to proofread emails when the user clicks the extension icon.

Usage requires a Gemini API key. There is a free usage tier that should be more than adequate for almost every user.

Not yet rated
26 users

OpenAI Proofreader

This extension uses OpenAI gpt-4o-mini to proofread emails when the user clicks the extension icon.

Usage requires an OpenAI API key. OpenAI does not offer a free usage tier. Proofreading a 4-5 paragraph email costs a fraction of a cent.

Not yet rated
37 users

SpaceHey - Quick Access

Quick Access to SpaceHey in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Not yet rated
2 users

ThunderCalc

A simple calculator for Thunderbird/Sea Monkey/Firefox, available in a pop-up window or a separate tab.

Not yet rated
37 users

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
747 users