Extensions by Name

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Statusus No Restart

Set your Facebook, Twitter etc. status by selecting a text on any page.

Not yet rated
3 users

StickyCharset

Allows persistent charset changes on individual messages. For use with messages that have erroneous charset header...

Rated 3 out of 5 stars (1)
46 users

StockTicker

Shows your favorite stocks in a customizable...

Rated 3 out of 5 stars (80)
167 users

StormCows

Allows two-way access between Remember The Milk and calendar events or todo items.

Rated 4 out of 5 stars (10)
511 users

Stylish

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.

Rated 4 out of 5 stars (735)
738,034 users

Stylish Tools

Quicker access to several Stylish features through a toolbar button and/or keyboard shortcuts. Available for Firefox, Thunderbird, and SeaMonkey

Rated 4 out of 5 stars (1)
1,178 users

Stylish-Custom

custom additions to Stylish extension.
brings back features from 0.5.9 and adds new features

I can't be bothered to change SC, so amo will allow it to be uploaded
http://choggi.org/misc/Stylish-Custom/

Rated 4 out of 5 stars (37)
2,609 users

Subject Cleaner

Remove extra strings from the subject while composing the message.

Rated 5 out of 5 stars (1)
552 users

Subject Manager

Manages subject of composed emails.

Rated 5 out of 5 stars (11)
2,171 users

Submit Word (Romanian)

An extention that allows users to submit words for inclusion in the Romanian dictionary.

Rated 5 out of 5 stars (3)
31 users

SubSwitch

Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.

Rated 4 out of 5 stars (6)
1,261 users

Sun Cult

Worldwide Sunrise, Sunset, Twilight, Moonrise and Moonset...

Rated 5 out of 5 stars (116)
7,378 users

SUNBIRD Button-**32** bit version-for Firefox 4.* and Thunderbird 3.*

A button to call up the Sunbird Calendar from Firefox and Thunderbird toolbars. This version for 32-bit operating system!

Not yet rated
52 users

SUNBIRD Calendar button- **64 bit** version for Firefox 4.* and Thunderbird 3.*

A button to call up the Sunbird Calendar from Firefox and Thunderbird toolbars . 64 BIT operating system version!

Not yet rated
61 users

Super Date Format

Fully customize the date format of the Date/Received column.

Rated 4 out of 5 stars (9)
2,372 users

SuperOffice Mail Link

Archive mail in SuperOffice CRM software from Thunderbird

Not yet rated
35 users

Switch Message Colour

Adds a Toolbar-Button to Thunderbird to switch between the mails' original colouring and your user defined colouring.

Not yet rated
369 users

Sync On Arrival

Downloads new message headers (and bodies, if configured) immediately when Thunderbird detects new messages in an IMAP folder - that's more or less what the "download_on_biff" preference promises to do, but somehow fails to deliver...

Rated 4 out of 5 stars (18)
224 users

SyncKolab

SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).

Rated 3 out of 5 stars (73)
7,060 users

SyncMab

This extensions can import and export mozilla address books at startup and exit of Thunderbird. You can first save a mab at a specific location e.g. on a network or the internet (Version 2.0) and then let it be updated every time TB starts up or...

Rated 3 out of 5 stars (21)
766 users