Open source firefox-extension projects
Every project in the registry tagged firefox-extension, ranked by real GitHub adoption.
Build AI agents and RPA workflows without writing code
Integrating ChatGPT into your browser deeply, everything you need is here
Captcha solver extension for humans, available for Chrome, Edge and Firefox
The cross-browser extension framework.
Reddit Enhancement Suite
Debloated fork of the extension "I don't care about cookies"
scanner detecting the use of JavaScript libraries with known vulnerabilities. Can also generate an SBOM of the libraries it finds.
Browser extension for reverse image search, available for Chrome, Edge and Safari
👻 Use your text editor to write in your browser. Everything you type in the editor will be instantly updated in the browser (and vice versa).
Firefox/Chrome browser extension. SmartProxy will automatically enable/disable proxy for the sites you visit, based on customizable patterns.
Privacy-focused translation with offline capabilities
Related tags
Frequently asked questions
How many open source firefox-extension projects are there?
This registry tracks 11 projects tagged firefox-extension, with 70,965 GitHub stars between them. The most-adopted is Automa at 21,624 stars.
Are these firefox-extension projects free to use?
Yes — 10 of the 11 carry an explicit open-source licence across 4 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-extension 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-extension projects still maintained?
9 of the 11 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.