Open source firefox projects
Every project in the registry tagged firefox, ranked by real GitHub adoption.
uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.
Privacy-focused browser with powerful customization
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.
Highlight and capture the web in your favorite browser. The official Web Clipper extension for Obsidian.
Debloated fork of the extension "I don't care about cookies"
Firefox/Chrome browser extension. SmartProxy will automatically enable/disable proxy for the sites you visit, based on customizable patterns.
Firefox fork with compiler optimizations and patches from Librewolf, Waterfox, and GNU IceCat.
Privacy-focused translation with offline capabilities
A libre Android browser built from scratch on Gecko. Privacy by default, powerful tab containers, and a local-first search engine.
Related tags
Frequently asked questions
How many open source firefox projects are there?
This registry tracks 12 projects tagged firefox, with 189,026 GitHub stars between them. The most-adopted is uBlock at 67,923 stars.
Are these firefox projects free to use?
Yes — 12 of the 12 carry an explicit open-source licence across 5 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?
12 of the 12 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.