Web Development

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IE View Requires Restart

Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.

Rated 3 out of 5 stars (155)
65,692 users

YouTube MP3 downloader by GreenMP3

YouTube MP3 downloader by GreenMP3

Rated 5 out of 5 stars (1)
1,089 users

Hide My IP VPN

Hide My IP VPN is number one tool for hiding your IP and unblocking any web site!

Rated 4 out of 5 stars (21)
14,589 users

User Agent Switcher Requires Restart

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Rated 4 out of 5 stars (271)
333,097 users

HAR Export Trigger

Trigger HAR export any time directly from within a page

Not yet rated
1,981 users

HostAdmin Requires Restart

Switch domain-ip mapping by a SIMPLE CLICK. In addition, DNS would be refreshed whenever your change host by HostAdmin or Manually.

Rated 5 out of 5 stars (27)
14,503 users

SelBlocks (for Selenium IDE) Requires Restart

This is a language extension for Selenium IDE that provides javascript-like conditionals, looping, callable functions, error catching, and JSON/XML driven parametrization.

Rated 4 out of 5 stars (2)
6,687 users

Default Responsive Design View

This add-on starts your browser in responsive design view by default.

Rated 5 out of 5 stars (2)
1,930 users

PerfectPixel

Allows developers to put a semi-transparent image overlay over the top of the developed HTML and perform per pixel comparison between them. Works with DevTools and Firebug

Official Firefox port of PerfectPixel for Chrome with 150 000+ active users

Rated 5 out of 5 stars (2)
2,452 users

Random Agent Spoofer

Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options

Rated 5 out of 5 stars (146)
230,730 users

Yandex Wordstat Assistant

Расширение, позволяющее значительно ускорить сбор слов с помощью сервиса подбора слова Яндекс (wordstat)

Rated 5 out of 5 stars (4)
3,930 users

PageDiff Requires Restart

Pagediff is a simple page compare application. It helps web developers and designers to see HTML-code(text) differences between web pages...
One can visit my site to download new version(new versions before release)

Rated 4 out of 5 stars (15)
1,709 users

JSON Lite Compatible with Firefox 57+

Fast JSON viewer - highlights, shows items count/size, handles large files

Rated 4 out of 5 stars (10)
6,022 users

Yandex.Metrika Requires Restart

Go to the reports, download maps links, the addition of the counter, etc.

Rated 2 out of 5 stars (7)
1,699 users

Remote XUL Manager

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (37)
81,744 users

Selenium IDE: Signature Requires Restart

Signature functions for Selenium IDE

Not yet rated
2,585 users

Pearl Crescent Page Saver screenshot tool Requires Restart

Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.

Rated 4 out of 5 stars (82)
83,748 users

Flash Debugger

Debug Flash/SWF/Flex files on the web. Edit properties and inspect elements on the fly. View log output inside the extension. Run AS3 code against the active SWF. Access assets with the Explorer, profile memory consumption and much much more...

Not yet rated
3,011 users

JSON Diff View

Easily compare JSON objects. Highlight the differences using colours in a tree structure representing the diff.

Source code can be found at https://github.com/rafspiny/jsondiff/

Not yet rated
1,583 users

FirePath Requires Restart

FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).

Rated 4 out of 5 stars (24)
103,328 users