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Compose Responsive Images

When writing new emails, newly inserted images are made responsive by setting style="max-width:100%" and removing width/height attributes.

Rated 5 out of 5 stars (2)
204 users

HTML Source Editor

Allows to edit the source of the currently composed message. A simple alternative to ThunderHTMLedit.

Rated 5 out of 5 stars (13)
4,661 users

Dino Game

Play the Dino game from Google Chrome and challenge friends to beat your score.

Rated 5 out of 5 stars (1)
12 users

Spam Scores

Displays spam scores according to mail headers. Supports spam/ham score headers of Rspamd, SpamAssassin and MailScanner. The add-on adds a column with the overall spam score to the mail list view and shows details of any matched spam/ham rule.

Rated 4 out of 5 stars (18)
1,877 users

Group Favorite Folders

An extension for Thunderbird 115+ that groups and sorts favorites folders in the compact view.

Rated 5 out of 5 stars (1)
361 users

Spellchecker Rumantsch Vallader

Spellchecker for Rumantsch Vallader

Not yet rated
6 users

Spellchecker Rumauntsch Puter

Spellchecker for Rumauntsch Puter

Not yet rated
3 users

Slack - Quick Access

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

Rated 5 out of 5 stars (2)
224 users

Open Google Chat

Adds an icon on the spaces toolbar to quickly open Google Chat.

Not affiliated with Google.

Rated 5 out of 5 stars (1)
411 users

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)
223 users

Arcus

Modern encryption in Thunderbird - powered by Rust, rage and WebAssembly

Rated 5 out of 5 stars (2)
17 users

ThunderbirdBravoClick2Call

Make a call to the selected phone number. Call the public numbers shown on the site via the BRAVO UCC SOLUTION platform by clicking or highlighting them

Not yet rated
1 user

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
14 users

Seams

Seams provides some integration with Patchwork, the patch tracking system. It makes the patch state visible directly from Thunderbird. It also displays useful links to a Patchwork instance or to mail archives, and commands to apply the patch locally.

Rated 5 out of 5 stars (2)
27 users

Minimize on startup

Minimize thunderbird window on startup!

Rated 4 out of 5 stars (8)
5,456 users

To must occur only once

This add-on changes all but the first "to" to "cc" if there are multiple "to" when replying to an email.

Rated 5 out of 5 stars (1)
25 users

Dropbox Paper

How Does It Work?
Once you install the add-on, a new icon will appear in the Thunderbird toolbar. Simply click on the icon, and it will open the Dropbox Paper tab.

Will the Dropbox Paper Add-on Collect My Data?
Never.

Not yet rated
41 users

Telegram - Quick Access

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

Rated 5 out of 5 stars (2)
172 users

Google Calendar - Quick Access

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

Rated 5 out of 5 stars (1)
1,357 users

Bard - Quick Access

Quick Access to Google Bard (new name Gemini) in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Not yet rated
18 users