Dark Reader
Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.
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Ghostery – Privacy Ad Blocker
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
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FoxyProxy Standard
FoxyProxy is an open-source, advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. No paid accounts are necessary; bring your own proxies or buy from any vendor. The original proxy tool, since 2006.
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User-Agent Switcher and Manager
Spoof websites trying to gather information about your web navigation—like your browser type and operating system—to deliver distinct content you may not want.
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Disconnect
Make the web faster, more private, and more secure.
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Download All Images
Easily save images with a wide range of customization features, such as file size, dimensions, and image type.
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Tab Reloader (page auto refresh)
An easy-to-use tab reloader with custom reloading time settings for individual tabs
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Clear Cache
Clear browser cache with a single click or via the F9 key. F9 Fever! ;)
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Measure-it
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
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Clear Browsing Data
Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.
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Tampermonkey
Tampermonkey is the world's most popular userscript manager.
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React Developer Tools
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.
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FireShot: Full Web Page Screenshots (♥♥♥♥♥)
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 Capture all open tabs or provide a list of the URLs for grabbing
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ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
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Wappalyzer
Identify technologies on websites
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Web Developer
The Web Developer extension adds various web developer tools to the browser.
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Vue.js devtools
DevTools extension for debugging Vue.js applications.
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Violentmonkey
Userscript support for browsers, open source.
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Windscribe - Free VPN and Ad Blocker
Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.
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User-Agent Switcher
Easily override the browser's User-Agent string
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Cookie-Editor
Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy.
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Cookie Quick Manager
An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion and much more). Firefox 57+ is supported.
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