Open source firefox projects
Every project in the registry tagged firefox, ranked by real GitHub adoption.
Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.
JavaScript API for Chrome and Firefox
uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.
Privacy-focused browser with powerful customization
🗃 Open source self-hosted web archiving. Takes URLs/browser history/bookmarks/Pocket/Pinboard/etc., saves HTML, JS, PDFs, media, and more...
Web Extension for saving a faithful copy of a complete web page in a single HTML file
Extract and decrypt browser data, supporting multiple data types, runnable on various operating systems (macOS, Windows, Linux).
Firefox for iOS
Firefox user.js for optimal privacy and security. Your favorite browser, but better.
All of source code of Floorp 12, the most Advanced and Fastest Firefox derivative 🦊
Fast file and video downloader with HLS, DASH and batch download support
Highlight and capture the web in your favorite browser. The official Web Clipper extension for Obsidian.
Chrome Debugging Protocol interface for Node.js
Debloated fork of the extension "I don't care about cookies"
Playwright for Go a browser automation library to control Chromium, Firefox and WebKit with a single API.
Remove AI features, telemetry data reporting, sponsored content, product integrations, and other annoyances from web browsers.
Firefox/Chrome browser extension. SmartProxy will automatically enable/disable proxy for the sites you visit, based on customizable patterns.
Free antidetect browser stealth for Playwright: undetected headless Firefox fingerprint. Python scraping, recaptcha and bot detection bypass. Open source
A powerful browser extension to create, edit and delete cookies
Markdown Viewer / Browser Extension
Firefox Profiler — Web app for Firefox performance analysis
A User-Agent spoofer browser extension that is highly configurable
Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and GNU IceCat.
A browser extension that deletes your news feed and replaces it with a nice quote
DuckDuckGo Privacy Essentials browser extension for Firefox, Chrome.
A libre Android browser built from scratch on Gecko. Privacy by default, powerful tab containers, and a local-first search engine.
Privacy-focused translation with offline capabilities
A powerful browser extension that supercharges DeepSeek Chat with custom tooling, persistent memory, and seamless project scaffolding. Generate and download fil
Fast, open and free-to-use new tab page for modern browsers
📦 Clients for building books with EpubPress.
Run any site JavaScript from Python with the real Firefox engine. Headless SpiderMonkey + Necko for automation and scraping.
Selenium that anti-bots cannot see, so no captchas: same API, anti-detect stealth headless Firefox, undetected fingerprint, bypass bot detection, Python web scr
Related tags
Frequently asked questions
How many open source firefox projects are there?
This registry tracks 32 projects tagged firefox, with 459,161 GitHub stars between them. The most-adopted is playwright at 99,121 stars.
Are these firefox projects free to use?
Yes — 32 of the 32 carry an explicit open-source licence across 6 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which firefox project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these firefox projects still maintained?
29 of the 32 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.