Tampermonkey is the world's most popular userscript manager.
480 566 users
FireShot makes full page screen captures - http://bit.ly/RlBQMV Screenshots are quickly captured and: ― Saved as Image / PDF with links and text * ― Sent to clipboard ― Printed ― Annotated * ― Uploaded * ― E-Mailed * * OS Windows only
154 491 users
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 "⚛️ Components" or "⚛️ Profiler" tab.
147 881 users
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
139 751 users
The Web Developer extension adds various web developer tools to the browser.
101 250 users
Identify technologies on websites
93 639 users
Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.
88 869 users
DevTools extension for debugging Vue.js applications.
86 023 users
Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!
79 459 users
Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.
56 844 users