IE View Requires Restart
Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.
YouTube MP3 downloader by GreenMP3
Hide My IP VPN is number one tool for hiding your IP and unblocking any web site!
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.
Trigger HAR export any time directly from within a page
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.
SelBlocks (for Selenium IDE) Requires Restart
This add-on starts your browser in responsive design view by default.
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
Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options
Расширение, позволяющее значительно ускорить сбор слов с помощью сервиса подбора слова Яндекс (wordstat)
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)
Fast JSON viewer - highlights, shows items count/size, handles large files
Yandex.Metrika Requires Restart
Go to the reports, download maps links, the addition of the counter, etc.
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.
Selenium IDE: Signature Requires Restart
Signature functions for Selenium IDE
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.
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...
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/
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).