Recently Updated Extensions

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Logout

This extension adds "Logout" to the folders/accounts context menu.

After you "Logout" you will be asked again for passwords for this account (incoming and outgoing) without the need to restart thunderbird.

Rated 5 out of 5 stars (1)
193 users
Updated July 5, 2025

Clear History Button

Adds a button to launch the Clear History dialog

Rated 5 out of 5 stars (1)
79 users
Updated July 5, 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 (50)
3,466 users
Updated July 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)
321 users
Updated July 5, 2025

Interstellar Alliance Social Experiment Step 3

Send the Interstellar Alliance Social Experiment Step 3 letter as an email to a predefined online list of recipients.

Not yet rated
2 users
Updated July 3, 2025

Markdown Here Revival

A revival of the popular Markdown-Here addon for Thunderbird.

Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.

Rated 4 out of 5 stars (18)
1,750 users
Updated July 1, 2025

Copy Sent to Current

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

Rated 4 out of 5 stars (106)
1,685 users
Updated July 1, 2025

Sum it up

The extension adds a button called Sum it up which takes content of a message and asks a locally running large model to summarize it in 50-100 words. It requires API of a llama.cpp or ramalama server running locally. No content leaves the local host.

Not yet rated
2 users
Updated July 1, 2025

Toggle Quotes (Collapse Quotes)

Adds a Toggle Quotes button, allows to collapse quotes.

Rated 4 out of 5 stars (1)
167 users
Updated July 1, 2025

Profile Switcher

Adds options to launch other profiles.

Rated 4 out of 5 stars (21)
3,205 users
Updated July 1, 2025

Header Tools Improved

Allows to modify headers and source of messages

Rated 5 out of 5 stars (41)
2,809 users
Updated July 1, 2025

Compact Headers

Limits displayed headers to 1 or 2 lines.

Rated 4 out of 5 stars (70)
12,073 users
Updated July 1, 2025

Extract 'Em! Featured

Extracts attachments from messages within an account or folder, with the option to select specific attachments. By default, extracted attachments are saved to a .zip file.

Rated 4 out of 5 stars (9)
8,112 users
Updated July 1, 2025

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.

Rated 3 out of 5 stars (1,727)
179,649 users
Updated July 1, 2025

j-lawyer.org-Thunderbird-Extension

Sendet E-Mails an einen j-lawyer.org Server

Note: This extension saves messages on a j-Lawyer.org server. Sensitive data may be transmitted. Depending on the type of connection, this data may also be unencrypted.

Rated 5 out of 5 stars (3)
62 users
Updated July 1, 2025

SentAutoMove

Let your replies follow their original message!

Rated 5 out of 5 stars (1)
19 users
Updated July 1, 2025

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

Rated 4 out of 5 stars (102)
181,551 users
Updated July 1, 2025

Search Button

Toolbar button to invoke message search dialog window.

Rated 5 out of 5 stars (10)
4,510 users
Updated July 1, 2025

keepassxc-mail

MailExtension to get password from KeePassXC.

Rated 4 out of 5 stars (7)
1,074 users
Updated July 1, 2025

userChromeJS

Load the contents of chrome/userChrome.js from the user's profile directory every time a window is opened. Also add a toolbar button which reloads userChrome.js in the current window.

Rated 5 out of 5 stars (8)
315 users
Updated July 1, 2025