Extensions by Name

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Splash! (Compatible version of Firefox 4)

Adds a splash screen. Supported in Firefox, Flock, Thunderbird, Sunbird, eMusic Remote, Songbird and Sunbird.

Rated 1 out of 5 stars (2)
20 users

Spoof Detector

Extension for Email Spoofing Detection

Rated 2 out of 5 stars (1)
65 users

SQLite Manager

Manage any SQLite database on your computer.

Rated 5 out of 5 stars (35)
191,722 users

SRB Lightning

An integrated calendar for Thunderbird build in purpose testing Serbian translation. You can download version: 1.0b2, 1.0b1 and 0.11 Inverse Edition which work with version 3.1, 3.0 and 2.0 Thunderbird. Windows, Linux and Mac are all supported.

Not yet rated
14 users

SS Ancestry Quick Button

A quick button link to the website, ssancestry.comyr.com/.

Not yet rated
45 users

Stacked Inspector

Switch DOM Inspector to an over/under vertical layout instead of the usual side-by-side panel layout.

Rated 5 out of 5 stars (9)
377 users

StartupMaster No Restart

Asks for the master password at startup (fixes multiple password prompt)

Rated 4 out of 5 stars (208)
14,451 users

Stationery

Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!

Rated 4 out of 5 stars (104)
35,515 users

Status-Bar Custom Buttons

Create your own status-bar buttons.

Rated 4 out of 5 stars (9)
67 users

Statusus No Restart

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

Not yet rated
4 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)
44 users

StockTicker

Shows your favorite stocks in a customizable...

Rated 3 out of 5 stars (80)
151 users

StormCows

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

Rated 4 out of 5 stars (10)
451 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 (742)
661,773 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)
1,071 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 (36)
2,363 users

Subject Cleaner

Remove extra strings from the subject while composing the message.

Rated 5 out of 5 stars (1)
557 users

Subject Manager

Manages subject of composed emails.

Rated 5 out of 5 stars (11)
2,225 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)
29 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)
1,112 users