Open source firefox-addon projects
Every project in the registry tagged firefox-addon, ranked by real GitHub adoption.
:octocat: Browser extension that simplifies the GitHub interface and adds useful features
Web Extension for saving a faithful copy of a complete web page in a single HTML file
🧩 The Browser Extension Framework
Integrating ChatGPT into your browser deeply, everything you need is here
🧡 Browser extension that simplifies finding and subscribing RSS and RSSHub
Blocks specific sites from appearing in Google search results
Highlight and capture the web in your favorite browser. The official Web Clipper extension for Obsidian.
The cross-browser extension framework.
Reddit Enhancement Suite
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.
A powerful browser extension to create, edit and delete cookies
Markdown Viewer / Browser Extension
Use native tab discarding method to automatically reduce memory usage of inactive tabs
Privacy-focused translation with offline capabilities
A power-user toolkit for ChatGPT Web — full and selective conversation export, PNG long-image export, deep-history search, timeline navigation, prompt managemen
A Chrome 🌐 & Firefox 🦊 extension to discover the latest developer news and tools in one tab!
Fast, open and free-to-use new tab page for modern browsers
MY NewTab: A Simple New Tab (browser's home page) inspired with Google's 'Material You' design
⏩ Fast-forwards long pauses between sentences — watch lectures ~1.5x faster (browser extension)
Chrome & Firefox extension for Notion to add 20+ features like sticky outline, small text & full width by default, hide comments & help button, bolder text etc.
Related tags
Frequently asked questions
How many open source firefox-addon projects are there?
This registry tracks 21 projects tagged firefox-addon, with 125,813 GitHub stars between them. The most-adopted is refined-github at 32,427 stars.
Are these firefox-addon projects free to use?
Yes — 21 of the 21 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-addon 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-addon projects still maintained?
20 of the 21 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.