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Recently

Recently is a small Mozilla Thunderbird extension for having the most recent contacts at hand

Not yet rated
70 users

Autocopy 78+

Automatically copy any text in an email when the text is selected.

Rated 4 out of 5 stars (5)
224 users

Quick Spaces

Makes it possible to add custom addresses to the spaces toolbar

Rated 4 out of 5 stars (4)
55 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

Date Time Formatter

Shows relative date-time in the column.
Note: you need to click "Select columns to display" and then -> "Relative Date/Time"

Not yet rated
79 users

Deselector

Adds a Deselect button to close messages.

Rated 4 out of 5 stars (1)
26 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)
100 users

YouTube RSS feed redesign

Adds YouTube thumbnails to RSS feed entries

Rated 5 out of 5 stars (1)
76 users

Minimize on Close

Causes Thunderbird's main window to minimize instead of closing. You can still close Thunderbird through the menu.

Rated 4 out of 5 stars (83)
39,122 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

Azerbaijani Spellchecker

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

Not yet rated
1 user

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)
50,730 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 (12)
328 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 (16)
2,139 users

Darko

Simple dark mode (theme) for your Thunderbird messages.

FastAddons.com/#darko

Rated 5 out of 5 stars (32)
5,701 users

Toggle HTML

Adds a Toggle HTML button

Rated 4 out of 5 stars (8)
1,101 users