Dark Reader
Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.
1,167,707 users
Ghostery – Privacy Ad Blocker
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
1,041,140 users
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.
207,770 users
Flagfox
Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
115,925 users
Stylus
Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.
111,062 users
Disconnect
Make the web faster, more private, and more secure.
96,198 users
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.
94,479 users
Download All Images
Easily save images with a wide range of customization features, such as file size, dimensions, and image type.
89,198 users
Tab Reloader (page auto refresh)
An easy-to-use tab reloader with custom reloading time settings for individual tabs
78,745 users
Clear Cache
Clear browser cache with a single click or via the F9 key. F9 Fever! ;)
63,886 users
Measure-it
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
27,321 users
Clear Browsing Data
Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.
18,995 users
Stylebot
Change the appearance of the web instantly
12,167 users
Tampermonkey
Tampermonkey is the world's most popular userscript manager.
680,592 users
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.
189,874 users
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
165,474 users
ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
150,542 users
Wappalyzer
Identify technologies on websites
122,973 users
Web Developer
The Web Developer extension adds various web developer tools to the browser.
91,758 users
Vue.js devtools
DevTools extension for debugging Vue.js applications.
87,613 users
Windscribe - Free VPN and Ad Blocker
Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.
87,607 users
Violentmonkey
Userscript support for browsers, open source.
82,920 users
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.
63,659 users
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.
62,855 users
User-Agent Switcher
Easily override the browser's User-Agent string
61,388 users