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MyTickets

Extension to mails that have TicketID: XXXX in Subject
It will Check to see if you have a "MyFolders" folder under your INBOX.
If yes it will create two child folders:
- Open
- Closed
IT will sync All Open Folder every 5 minutes

Not yet rated
15 users
Updated July 9, 2025

OpenDetachedAttachments

Allows opening of detached attachments if they have been moved

Not yet rated
0 users
Updated July 9, 2025

SPAMBEE

Report any unsollicited email (SPAM, Phishing, ...) to SPAMBEE.
Get an alert if you open an email containing a URL already known as fraudulent.
All reports are anonymized, no registration is required.

Rated 4 out of 5 stars (6)
1,269 users
Updated July 9, 2025

Signal Spam

Add simple functions to report spams or phishing to Signal Spam by one click.
The add-on will also alert you if you open a fraudulent e-mail (phishing).

Rated 2 out of 5 stars (185)
14,457 users
Updated July 9, 2025

10ten Japanese Reader (Rikaichamp)

Look up Japanese words with the hover of a mouse.

After enabling the add-on from the toolbar (or press Alt+R) simply hover over Japanese text and a popup displays corresponding dictionary definitions.

Rated 5 out of 5 stars (4)
240 users
Updated July 9, 2025

QNote

Add sticky notes to your emails with this feature-rich, drop-in replacement for the XNote++ extension.

Rated 5 out of 5 stars (66)
6,159 users
Updated July 9, 2025

cb_thunderlink

cb_thunderlink is a thunderlink replacement.
Clickable, durable links to specific messages inside Thunderbird.

Rated 5 out of 5 stars (8)
238 users
Updated July 9, 2025

Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the support page on how to use and why it sometimes does not work!

Rated 5 out of 5 stars (38)
8,629 users
Updated July 9, 2025

Thunderbird Send

[IMPORTANT] This is a pre-release version Thunderbird Send. We will gradually open it for beta testing.
This add-on is built and maintained by your friends at Thunderbird.
Stay tuned to updates on thunderbird.net

Not yet rated
55 users
Updated July 8, 2025

Thunderbird Vericode

Automatically detects verification codes in received emails and displays a notification that you can click to copy the code to clipboard.

Rated 5 out of 5 stars (2)
15 users
Updated July 8, 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
1 user
Updated July 7, 2025

PrioMailbox

PrioMailbox helps you prioritize your Thunderbird inbox by automatically tagging and highlighting important emails. Trainable tags organize your inbox efficiently, saving time and reducing distractions, with a simple, user-friendly interface.

Not yet rated
148 users
Updated July 6, 2025

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)
184 users
Updated July 5, 2025

Clear History Button

Adds a button to launch the Clear History dialog

Rated 5 out of 5 stars (1)
78 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)
3,248 users
Updated July 5, 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)
1,827 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)
1,630 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
4 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)
160 users
Updated July 1, 2025

Profile Switcher

Adds options to launch other profiles.

Rated 4 out of 5 stars (21)
3,019 users
Updated July 1, 2025