L-Square Responsive Design Inspector Requires Restart
Browser pixel rulers to help inspect window widths of adaptive designs. The add-on button acts as a toggle that adds rulers similar to a graphics app to measure the current window resolution.
Resolves the element under the mouse to the shortest css selector that uniquely identifies it
Fleck - Save the best of the Web Requires Restart
Fleck allows you to bookmark websites including your own sticky notes on top of them. Save the best of the web. Work in groups and start building your collective knowledge base together.
Search through all your favorite websites and those of your fri...
iWEBTOOL Webmaster's Toolbar Requires Restart
Access webmaster services and web tools from iWEBTOOL directly from the web browser.
Personas Interactive Theme Engine Requires Restart
Created by http://BrandThunder.com where you can Build Your Own Browser Theme. Remove the limits of Personas. Get unlimited Personas, legible text; use with Firefox themes installed. Create your own Personas gallery; full CSS3 backgrounds, and more
Seo&Sem Requires Restart
SEO toolbar – addon for instant analysis of the site parameters.
Test IE allows users to preview and test their websites in all versions of Internet Explorer (IE6, IE7, IE8, IE9, IE10 and IE11) directly in BrowserStack through Mozilla Firefox.
Relaxed the HTML Validator Requires Restart
"Relaxed" is a HTML validator which validates HTML documents using it's own schema definitions written in Relax NG with embedded Schematron patterns.
xpath finder Requires Restart
Find and experiment with xpath in web pages easily.
Forex Fox Requires Restart
Forex Fox is an extension for Firefox that displays currency exchange rates in your status bar. ...
Check My Colors! Requires Restart
This addon is a button that can be added to the tool bar. To add, right click on the toolbar and select customize. It will then allow you to place a button on the toolbar to run the tests. This is a tool that will allow web developers to analyze thei...
Sourceforge Direct Download Requires Restart
If you frequently download files from Sourceforge projects, use this extension to automatically convert download links to use your favorite mirror (instead of having Sourceforge prompt...
RightClickXSS Requires Restart
This addon adds a right-click menu option to insert sample XSS payloads into textboxes for security testing. Useful for security researchers or developers testing for cross-site scripting in web applications.
Short URL Creator with Surl.ME Requires Restart
Shorten long URLs and copy to Clipboard with a single click :]
Ewhois Requires Restart
Created for www.ewhois.com which allows you find out websites belong to the same owner.
Easily find the common name for all Windows NT versions with this convenient popup chart.
Have the Windows NT history at your fingertips with the push of a button!
Active Whois plugin for Firefox Requires Restart
Starting Active Whois to get details about any Web site owner and its host server...
CSS Live Reloader is a firefox extension to ease website CSS development. The extension reloads a page CSS whenever it changes on the server, resulting in something close to live editing of the Cascading Stylesheet.