Open source manifest-v3 projects
Every project in the registry tagged manifest-v3, ranked by real GitHub adoption.
The cross-browser extension framework.
A free, open-source Chrome extension - no ads, no tracking. Based on The Great Suspender, cleaned up and actively maintained.
Passive API key and secret discovery browser extension for Chrome and Firefox. 80+ detection patterns, zero config.
Related tags
Frequently asked questions
How many open source manifest-v3 projects are there?
This registry tracks 3 projects tagged manifest-v3, with 7,270 GitHub stars between them. The most-adopted is extension.js at 5,161 stars.
Are these manifest-v3 projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 2 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 manifest-v3 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 manifest-v3 projects still maintained?
3 of the 3 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.