Tampermonkey is the world's most popular userscript manager.
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
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
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.
The Web Developer extension adds various web developer tools to the browser.
Identify technologies on websites
Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.
DevTools extension for debugging Vue.js applications.
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.
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