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AskForSanitize

Revives the 'Clear Private Data' dialog on Firefox exit

Rated 5 out of 5 stars (16)
1,895 users

MitM Me (Cert Error Bypass)

For IT admins who want very much to click through thousands of self-signed certificate warnings and get MitM attacked, this simplifies the process.

Development was discontinued, for details please read "About"

Rated 5 out of 5 stars (12)
1,018 users

MetaTags

This sidebar displays page meta-information (metatags, links, etc.) Has automated search engine submission menu. Features include: Watches currently loaded Web page and automatically updates the sidebar. Displays metatags, links, language, base...

Rated 5 out of 5 stars (8)
94 users

HackTheWeb

The Web. Displayed Your Way.
Click to zap away rubbish.
Hack out the noise, read, print in peace.
* Widen Elements & Text.
* Save the changes to Stylish.
* Remove Sidebars & Ads.
* Black on White.
* Isolate.
User empowerment (bsd on aardvark)

Rated 5 out of 5 stars (29)
4,677 users

TYC + PR indicator

This simple indicator shows Google Page Rank and Yandex TYC for current web page

Rated 5 out of 5 stars (27)
4,137 users

Copy Fixer

Copy the page title and URL using Ctrl-C or Command-C.

Rated 5 out of 5 stars (10)
1,111 users

Disconnect Featured

Make the web faster, more private, and more secure.

Rated 5 out of 5 stars (79)
208,461 users

iMacros for Firefox

Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...

Rated 4 out of 5 stars (342)
290,459 users

Modify Headers

Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.

Rated 5 out of 5 stars (62)
117,373 users

FireCal

Calculator Suite

Rated 5 out of 5 stars (11)
77 users

WCAG Contrast checker

Checks for compliance with the contrast levels, brightness and shine in the color combination of foreground and background of textual content based on the requirements of WCAG 1 and WCAG 2.

Rated 5 out of 5 stars (8)
4,061 users

Jenkins Build Monitor

Monitor Jenkins (http://jenkins-ci.org) builds and display the status on Firefox status bar.
OS X users, don't forget to install Growl http://growl.info/ .

Rated 5 out of 5 stars (41)
1,378 users

View Dependencies

View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.

Rated 5 out of 5 stars (26)
5,485 users

XPath Checker

An interactive editor for XPath expressions.

Rated 5 out of 5 stars (17)
23,485 users

Read Easily

Fast page style switcher. It adds toolbar button, context menu item and hotkey (CTRL+ALT+Z) to disable/enable styles on web pages.

Rated 5 out of 5 stars (17)
1,087 users

Goog All Sites & Similar Sites Search

Now you don't have to rely on a website's search any more, rather use this website-specific Google search. Bonus is Similar site search. Just on a click, it gets you the list of websites similar to the one opened in active tab.

Rated 5 out of 5 stars (6)
1,284 users

Tabbed View Source No Restart

View Page Source in New Tab, Current Tab or New Window

Rated 5 out of 5 stars (6)
312 users

Pic Style - Checkerboard

Add a checkerboard background on Firefox view image pages to help show image transparency.

Rated 5 out of 5 stars (6)
66 users

Live HTTP Headers

View HTTP headers of a page and while browsing.

Rated 4 out of 5 stars (136)
193,927 users

Server Switcher

Easily switch between your development and live servers.

Rated 5 out of 5 stars (46)
1,670 users