Top-Rated Extensions

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Mail Merge Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (114)
44,916 users

Open Long Url

Adds an option to your File menu to allow you to open long, multi-line...

Rated 5 out of 5 stars (7)
221 users

Version in Add-on bar

Show the Firefox/Thunderbird version number in the addon bar (formerly called status bar).

Rated 5 out of 5 stars (8)
652 users

PONG! Multiplayer

Play a game of PONG! while you are waiting.

Rated 5 out of 5 stars (7)
163 users

Personas Shuffler No Restart

Change your Personas theme on each browser load.

Rated 5 out of 5 stars (10)
4,926 users

Equations

Insert inline LaTeX equations into e-mail messages.

Rated 5 out of 5 stars (21)
278 users

Automatic dictionary switching No Restart

Extension that remembers the language of the spellchecker used when composing and switches to it every time you write to that person.

Rated 5 out of 5 stars (14)
2,599 users

More Tools Menu

Unclutter the "Tools" menu by moving new items to a "More Tools" menu.

Rated 5 out of 5 stars (31)
4,800 users

Header Tools Lite

Allows to modify the header and the source of messages

Rated 5 out of 5 stars (16)
4,071 users

CompactHeader Featured

Add symbol in header plane to switch between compact and expanded view. Options to switch between one or two lines compact view, which buttons should be displayed in header pane. Linkify RSS subject. Optionally darkens header if message has focus.

Rated 5 out of 5 stars (147)
185,856 users

THUNDER!Box

Thunder!Box allows transferring contacts from your Thunderbird-Addressbook to the phonebook of a connected AVM FRITZ!Box FON router and back. You may also use your addressbook to initiate calls.

Rated 5 out of 5 stars (24)
2,312 users

AutoCopy 2

Copies selected text to the clipboard automatically.

Rated 5 out of 5 stars (39)
15,964 users

Simple Timer

A timer/clock residing in the toolbar.

Rated 5 out of 5 stars (81)
17,117 users

中止ボタンがしいたけに見えて困る

Huh, you said the stop button looks like shiitake? No way, you must be tired.

Rated 5 out of 5 stars (21)
1,815 users

Quicktext

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Rated 5 out of 5 stars (220)
80,591 users

S3.Google Translator

S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!
It supports translation of selected text, entered phrase or whole webpage between any of 80+ languages.

Rated 5 out of 5 stars (99)
182,763 users

SQLite Manager

Manage any SQLite database on your computer.

Rated 5 out of 5 stars (57)
215,620 users

UnMHT No Restart

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 5 out of 5 stars (184)
89,175 users

No Message Pane Sort by Mouse

No Message Pane Sort prevents accidental resorting of the message pane by disabling mouse button clicks on the column headers.

It is still possible to sort messages by ctrl-clicking the header.

Rated 5 out of 5 stars (17)
1,419 users

IranZilla

IranZilla provides the following services in Thunderbird:

* Adds a column in the mail view for displaying Iranian dates for each email.
* Supports both English and Persian Iranian month names.
* Adds a context menu item for copying the Iranian dates...

Rated 5 out of 5 stars (15)
216 users