Dark Reader
Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.
1 074 261 users
Ghostery – Privacy Ad Blocker
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
947 481 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.
193 486 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...
111 807 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.
106 940 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.
95 098 users
Download All Images
Easily save images with a wide range of customization features, such as file size, dimensions, and image type.
87 829 users
Disconnect
Make the web faster, more private, and more secure.
87 777 users
Tab Reloader (page auto refresh)
An easy-to-use tab reloader with custom reloading time settings for individual tabs
78 460 users
Clear Cache
Clear browser cache with a single click or via the F9 key. F9 Fever! ;)
61 514 users
Measure-it
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
26 090 users
Clear Browsing Data
Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.
18 952 users
Stylebot
Change the appearance of the web instantly
11 141 users
Tampermonkey
Tampermonkey is the world's most popular userscript manager.
660 589 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.
183 309 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
161 681 users
ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
144 457 users
Wappalyzer
Identify technologies on websites
122 724 users
Web Developer
The Web Developer extension adds various web developer tools to the browser.
86 449 users
Vue.js devtools
DevTools extension for debugging Vue.js applications.
84 471 users
Violentmonkey
Userscript support for browsers, open source.
84 140 users
Windscribe - Free VPN and Ad Blocker
Windscribe helps you circumvent censorship, block ads, beacons and trackers on websites you use every day.
83 380 users
User-Agent Switcher
Easily override the browser's User-Agent string
63 785 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.
60 808 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.
60 270 users