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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)
367 users

StackOverflowiser No Restart

This extension will automatically redirect any pages on a StackOverflow clone site to the original question back on StackOverflow (or StackExchange site).

Rated 3 out of 5 stars (1)
21 users

StatShow - Free Website Worth Estimator

Using the right click button it can estimate website worth, traffic(visitors and pageviews), advertisement earnings, alexa rank, backlinks, whois info and more.

Rated 4 out of 5 stars (1)
218 users

Statsticker.com - Statystyki Stron Internetowych

Wtyczka do Firefoxa do analizy strony internetowych przy pomocy statsticker.com.

Not yet rated
34 users

Status Watch No Restart

Shows a notification if any HTTP requests on the page fail.

Rated 4 out of 5 stars (3)
119 users

steplog

Steplog records every event on browser window (e.g. onLoad, onClick, etc...) as PNG image automatically.

Not yet rated
11 users

Storage Inspector

Starting with Firefox 2, Storage Inspector makes it easy to view any sqlite database files in the current profile. This includes the anti-phishing and search engine...

Rated 5 out of 5 stars (4)
22 users

Stored Variables (Selenium IDE)

A plugin for Selenium-IDE to interactively explore and manage stored variables

Rated 5 out of 5 stars (1)
3,872 users

Stream MP3 Youtube Downloader /streamconverter.com

This Addon adds conversion & download links to many streaming sites like youtube, myvideo etc

Dieses Addon fügt zu Streaming-Sites wie Youtube und MyVideo Download-Links hinzu.

More Information / Weitere Infos: http://www.streamconverter.com

Rated 1 out of 5 stars (5)
2,478 users

Strict Transport Security - Detector

It scrutinizes the HTTP Response Headers for the presence of Strict-Transport-Security Header. Information gathering tool to fingerprint the web server capability to show resistant to MITM (Man In The Middle) (sslstrip exploitation).

Not yet rated
254 users

Style Editor

Style Editor places an add-on bar button that open Firefox Style Editor qucikly.

Rated 1 out of 5 stars (1)
645 users

Style Sheet Chooser II

Style Sheet Chooser II allows you to choose author-provided alternate style sheets for a web site, and have those choices be persisted for all pages on the same site. Style Sheet Chooser II replaces Firefox's built-in style sheet switcher - its...

Rated 2 out of 5 stars (1)
40 users

Styles Tuner

"Styles Tuner" allows you to change fonts and colors for all sites in your browser.

Rated 4 out of 5 stars (22)
1,215 users

StyleSheet Chooser Plus

StyleSheet Chooser Plus (aka SSCP) persists choice of website stylesheets.

Rated 5 out of 5 stars (17)
143 users

Stylish Featured

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 (728)
760,326 users

Stylish Sync No Restart

Sync engine for Stylish with backup / restore facility.

Rated 5 out of 5 stars (19)
5,938 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)
1,096 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 (38)
2,768 users

Stylus No Restart

This add-on exposes the ability to make GET and POST network requests via the request module. This grants pages from allowed domains (or directory paths) the ability to make such requests whilst not being subject to same-origin policy
^^

Not yet rated
11 users

Subscriberinfo

The subscriberinfo extension allows testing of mobile sites that use the "subscriberinfo" URI scheme with Firefox...

Rated 5 out of 5 stars (5)
47 users