Contributing to Firefox: Source Code, Builds, and Support
Want to contribute to Firefox development? Mozilla provides comprehensive documentation on the source code directory structure (https://firefox-source-docs.mozilla.org/contributing/directory_structure.html) and a quick reference for contributions (https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html), guiding you through building Firefox and creating patches. Need help? Join the Matrix `Introduction` channel (https://chat.mozilla.org/#/room/#introduction:mozilla.org) for support. You can also download nightly builds for testing (https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/ or https://www.mozilla.org/firefox/channel/desktop/#nightly), but be aware that these may contain bugs.