Top-Rated Extensions

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Tidybird Requires Restart

Organize email into folders quickly and easily.

Rated 3 out of 5 stars (5)
218 users

Forumzilla Requires Restart

Forumzilla lets you read news and blog feeds in your email application. It is similar to the feed reader built into Thunderbird, but it lets you download stories into any folder in any POP, IMAP, or local account (configurable per...

Rated 3 out of 5 stars (5)
0 users

UxU - UnitTest.XUL Requires Restart

This is a testing tool for addon developers.

Rated 3 out of 5 stars (5)
1 user

folderplus Requires Restart

This extension adds some basic missing features about folders.
Move mails to their conversation folder. Navigate to folder with new keyboard shortcuts.

Rated 3 out of 5 stars (5)
338 users

X-Unsent support Requires Restart

Adds support for the X-Unsent header.

Rated 4 out of 5 stars (3)
359 users

Grammar Checker Requires Restart

Checks grammar using LanguageTool.

Rated 3 out of 5 stars (7)
2,889 users

ltnPlus Requires Restart

Version 0.9:
Support printing of tasks for Lightning 0.8/0.9.

Up to version 0.2:
Enhancements to Lightning that are known from Sunbird: Unifinder (for events and todos) and moving MiniMonth to Tabpanel

Rated 3 out of 5 stars (8)
0 users

Google+ Tab Requires Restart

Google+ Tab for Thunderbird

Rated 3 out of 5 stars (8)
1,209 users

Resize Header Requires Restart

An addon to let you resize the message header pane.

Rated 3 out of 5 stars (4)
187 users

About:about Button

A button that lists all the about pages that exist. Some of these pages are also provided as separate buttons.

Rated 3 out of 5 stars (4)
127 users

WebPG for Mozilla Requires Restart

An extension which provides GnuPG/GPG/PGP related functions to Moizilla Firefox, Thunderbird and Seamonkey

Rated 3 out of 5 stars (24)
593 users

Free Memory Button

Free unused memory that Firefox is currently using.

Rated 3 out of 5 stars (8)
2,438 users

Shedule Filters Requires Restart

Sheduled run message filters

Запуск фильтров сообщений по расписанию

Rated 4 out of 5 stars (2)
153 users

TheRealURL Requires Restart

Get URL information: expand short URLs, get title and content type information without visiting the site.

UPDATE, AUG 2013: THIS EXTENSION IS NO LONGER SUPPORTED. The source is open - if you wish to take on the development, you're welcome.

Rated 3 out of 5 stars (7)
183 users

EmailPicky 4 Requires Restart

Grab email addresses from emails from any selected Email Folder and add them to your contacts. (Email Crawler / Email ID Grabber / Bounced email collector) - Thunderbird Plugin
Note: It doesn't create duplicates, but shows as 'xxx messages added'.

Rated 3 out of 5 stars (14)
3,721 users

ThunderStats! Your Thunderbird Statistics! Requires Restart

Do you remember the old good Eudora statistics? Do you miss them?
Using this addon you can finally keep an eye on how you use your beloved Thunderbird!

Rated 3 out of 5 stars (5)
1,382 users

Remote Content By Folder

Decide whether to allow or block remote content in messages by comparing the names of the folders in which they are located to configured regular expressions.

Rated 5 out of 5 stars (1)
54 users

Diagnostics for Adblock Plus

Diagnostics tool for Adblock Plus, provides some insight into internal processes of Adblock Plus.

Rated 3 out of 5 stars (4)
9,654 users

TB Change From and Fcc on Compose Extension Requires Restart

You can now temporarily change the from and fcc on...

Rated 3 out of 5 stars (12)
0 users

Personasizer

Personasizer allows you to expose more of your persona's header image. Useful for personas that have text or an important part of their content cut off by the browser's navigation elements.

Rated 3 out of 5 stars (6)
11 users