gecko-dev
SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org
This repository is a read-only mirror of the Firefox browser source code. Mozilla, the non-profit organization behind Firefox, maintains the actual development history in a separate version control system called Mercurial, and this Git copy exists so that developers who prefer Git tooling can browse the code. The repository description notes it has been superseded by a newer mirror location.
Firefox is a web browser focused on speed, reliability, and privacy. If you want to contribute to it, Mozilla points contributors to their documentation site and uses Bugzilla as the place to file and track bugs. There is also a community chat room on Matrix for people with questions about working on the browser source.