Web Development

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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.

Rated 3 out of 5 stars (4)
2,464 users

CSS Resolver

Resolves the element under the mouse to the shortest css selector that uniquely identifies it

Rated 3 out of 5 stars (4)
524 users

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...

Rated 2 out of 5 stars (7)
6 users

iWEBTOOL Webmaster's Toolbar Requires Restart

Access webmaster services and web tools from iWEBTOOL directly from the web browser.

Rated 2 out of 5 stars (7)
11 users

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

Rated 2 out of 5 stars (39)
10,432 users

Seo&Sem Requires Restart

SEO toolbar – addon for instant analysis of the site parameters.

Rated 2 out of 5 stars (5)
458 users

Test IE

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.

Rated 2 out of 5 stars (9)
3,481 users

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.

Rated 2 out of 5 stars (4)
22 users

xpath finder Requires Restart

Find and experiment with xpath in web pages easily.

Rated 2 out of 5 stars (7)
6,812 users

Forex Fox Requires Restart

Forex Fox is an extension for Firefox that displays currency exchange rates in your status bar. ...

Rated 2 out of 5 stars (3)
2 users

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...

Rated 2 out of 5 stars (3)
1 user

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...

Rated 2 out of 5 stars (3)
11 users

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.

Rated 3 out of 5 stars (2)
438 users

Format Javascript Requires Restart

The extension provide Javascript developer a tool to decompress the minified javascript. Minify javascript and use it to uncompress.

Rated 3 out of 5 stars (2)
352 users

Short URL Creator with Surl.ME Requires Restart

Shorten long URLs and copy to Clipboard with a single click :]

Rated 3 out of 5 stars (2)
46 users

Ewhois Requires Restart

Created for www.ewhois.com which allows you find out websites belong to the same owner.

Rated 3 out of 5 stars (2)
29 users

Windows NT Chart

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!

Rated 3 out of 5 stars (2)
8 users

Active Whois plugin for Firefox Requires Restart

Starting Active Whois to get details about any Web site owner and its host server...

Rated 2 out of 5 stars (12)
281 users

JS Switcher

Turns on and off JavaScript

Rated 2 out of 5 stars (3)
295 users

CSS Live Reloader

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.

Rated 2 out of 5 stars (3)
1,018 users