To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Create automated cross-browser functional tests easily and quickly.
Random Agent Spoofer No Restart
Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.
Enter up to 5 equations into this toolbar, then view the graphs using Firefox native SVG support. The toolbar allows rescaling the x and y coordinates and redefining the domain. Contributions go directly to the Boys & Girls Club.
View HTTP headers of a page and while browsing.
Live HTTP Header Fix By Danyial ITs Working On Firefox Again Fixed Reply Problem
Custom User-Agent String No Restart
Set custom User-Agent string. Also available for Firefox on Android.
Textise No Restart
Creates a text-only version of almost any web page. Great for accessibility, SEO and printing.
iMacros for Firefox Featured
Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...
FireMath is an equation editor based on MathML, the mathematical markup language.
Find examples, FAQ, installation instructions and a discussion board at
Speed up scientific scripting! Improve your science!
Configures Mozilla Firefox for use with Charles Web Debugging Proxy.
This is a firefox addon that allows the user to enable CORS everywhere by altering http responses.
Saving form data to bookmarklets
Allows to copy selected text as plain text by adding a 'Copy as Text' menu item to context menu.
Proxy Switcher No Restart Featured
Access to the complete Firefox's proxy settings right from a toolbar panel
Google Analytics Debugger No Restart
A devtools extension for debugging Google Analytics tracking code
RESTED No Restart
A REST client for the rest of us
Remote XUL Manager No Restart
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.
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.
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.