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Deselector

Adds a Deselect button to close messages.

Rated 4 out of 5 stars (1)
39 users

Junk Mail ByeBye

This extension identifies and protects you from spam emails, phishing emails, and other unwanted messages. It is primarily targeted towards filtering out spam in Japanese.

Rated 4 out of 5 stars (1)
289 users

Mailfence - Quick Access

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

Not yet rated
6 users

Microsoft Teams - Quick Access

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

Rated 2 out of 5 stars (1)
477 users

Apply ROT13

Apply ROT13 to selected text in messages.

Select any text in the message body, right-click on the selection to open the context menu and select "Apply ROT13". Alternatively, you can use a configurable keyboard shortcut (Ctrl-Shift-D by default).

Rated 5 out of 5 stars (1)
26 users

Google Mail Tab

Button to open Google Mail, supports multiple accounts. Useful if you need to configure mail settings, filters or forwarding in Gmail.

Not yet rated
48 users

Khmer Spellchecker

Khmer (km-KH) spellchecker by Tim Boeun.

Rated 5 out of 5 stars (2)
8 users

Uzbek spell checker

This is a spell checker for Uzbek language in Latin script.

Not yet rated
1 user

Dictionnaire orthographique kikongo

Correcteur orthographique en kituba de RDC, kikongo ya leta

Not yet rated
1 user

Simpler English Dictionary Requires Restart

A Simpler English Spellchecker.

Not yet rated
1 user

Haitian Creole spell checker

Korektè Òtograf Kreyòl (KÒK) se yon korektè òtograf otomatik gratis nan lang Kreyòl Ayisyen ki develope avèk èd LOGIPAM ak Kevin Scannell
Korektè Òtograf Kreyòl (KÒK) is a free Haitian Creole Spell Checker developed by LOGIPAM and Kevin Scannell

Rated 5 out of 5 stars (1)
13 users

FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 4 out of 5 stars (22)
52,559 users

Hide Email Folders

Hide Email Folders from the Folder pane (Left pane).
Note: This addon only works for Unified pane/folder mode.
Note #2: Please note that this addon only hide email folders and NOT local folders!
Special thanks to John Bieling, C-E and Alex Cabal.

Rated 4 out of 5 stars (13)
373 users

Azerbaijani Spellchecker

Azerbaijani SpellChecker for Mozilla Firefox. Developed with love by Mozilla Azerbaijan.

Not yet rated
1 user

OpenFolder

This add-on makes it easy to open folders on a file server.

In order to use the add-on, you need to install two things: the add-on and the linked app.
You can download the linked app from the following website.

https://openfolder.net/

Rated 3 out of 5 stars (2)
163 users

Outlook Address Book Enabler

Enables the Outlook address book in Thunderbird.

Rated 4 out of 5 stars (1)
1,312 users

Mail Merge P

Mail Merge P (Mail Merge with Preview) is a Thunderbird add-on to send bulk emails based on data provided in a spreadsheet. It uses the nunjucks templating engine.

Rated 3 out of 5 stars (17)
2,192 users

Thematic

Quickly switch between your themes or back to the default.

Rated 3 out of 5 stars (2)
560 users

Old (classic) Icons

This replaces the new monochrome icons with the old/classic colorful icons. Uses the code from Phoenity Icons and the graphics from older Thunderbird versions.

Rated 5 out of 5 stars (31)
2,702 users

MyPhoneExplorer

This Addon is needed to sync your Android based smartphone with Thunderbird with the Software "MyPhoneExplorer". You can get MyPhoneExplorer from: https://www.fjsoft.at

Rated 4 out of 5 stars (18)
9,837 users