See Google Pagerank (PR) and Alexa rank for each website you visit. Simple and customizable. You can see and use everything the toolbar offers, or strip it down to the bare essentials and place it in the status bar. Simple, quick, and very useful.
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).
Google Analytics Debugger No Restart
A devtools extension for debugging Google Analytics tracking code
Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.
Custom UserAgent String No Restart
Add a custom useragent string for desired URLs or domains.
JSON-handle No Restart
JSON编辑器,It's a browser and editor for JSON document.You can get a beautiful view.
Pick That Color No Restart
A lightweight addon for selecting any color from web pages. It copies the Hex color code of any pixel that is displayed in your browser to clipboard. Just click the color wheel button near your address bar or press 'Ctrl+Shift+z'.
Modify Header Value (HTTP Headers) No Restart
Add, modify or remove a header for any request on desired domains.
A plugin for Selenium-IDE to have favorite test suites and open and execute the test suites with a single click
Signature functions for Selenium IDE
A debugger for SSO by filtering HTML requests, flagging authentication messages and displaying SAML messages.
Configures Mozilla Firefox for use with Charles Web Debugging Proxy.
Toggle responsive design mode with a button.
HTTP/2 and SPDY indicator No Restart
An indicator showing HTTP/2 and SPDY support in the address bar.
Flash Debugger No Restart
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...
Perl code formatters for Selenium IDE Project
Find and experiment with xpath in web pages easily.
Hide My IP VPN No Restart
Hide My IP VPN is number one tool for hiding your IP and unblocking any web site!
React Developer Tools No Restart
React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the React tab.
Panda Daily News & Inspiration No Restart
Keeping designers and hackers inspired every day.
The must have app for designers and hackers. Comfortably browse Hacker News, Designer News, Product Hunt, Dribbble, Behance and others all in one place. Never miss anything, again.