PWAsForFirefox helps users install, manage, and use Progressive Web Apps in Mozilla Firefox.
Free
18 alternativesFirefox
Mozilla's official repository contains the source code for Firefox, a web browser with builds for Windows, macOS and Linux.
About Firefox
This listing opens Mozilla's official source repository for Firefox. It is useful for developers who want to inspect the browser code, read contribution guidance or find the project's source documentation. Firefox uses Bugzilla for bug reports. The repository points contributors toward Nightly development builds, with a Matrix introduction channel for development questions that the source documentation does not answer. People who want to browse can download the finished desktop app from the official Firefox website.
Firefox itself is a free browser for Windows, macOS and Linux. Its everyday features include extensions, reader mode, picture-in-picture video and tab groups. Total Cookie Protection separates cookies by website to limit cross-site tracking. If a page breaks, you can make a tracking-protection exception for that site while keeping protection active elsewhere. Optional Sync lets you choose which bookmarks, passwords, tabs and other supported data to share between your devices.
Key features
- Inspect Firefox source code in Mozilla's official repository
- Follow source documentation and contribution guidance
- Report browser bugs through Bugzilla
- Use browser extensions, reader mode and picture-in-picture
- Separate cookies by website with Total Cookie Protection
- Choose supported browsing data to sync across devices
Best for: Developers exploring Firefox's source and contribution process, plus people checking how the desktop browser relates to the project.
Good for
- Official source destination with links to contributor documentation
- Finished browser is free for Windows, macOS and Linux
- Browser includes site-specific privacy controls and optional data sync
Watch out for
- This destination is a source repository, so app downloads and user support require the linked product sites
- Tracking protection can need a per-site exception when it breaks page functionality
Firefox at a glance
- Category
- Software & Utilities › Firefox Extensions
- Type
- Open-source project
- Pricing
- Free
- Platforms
- Linux, macOS, Windows
- Details verified
- Oct 20, 2026 · Official source
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Firefox FAQ
Where should I report a Firefox bug?
The repository directs bug reports to bugzilla.mozilla.org. Follow the linked contributor and reporting guidance there.
Do I need to compile Firefox to install it?
No. The official Firefox website provides finished browser downloads for Windows, macOS and Linux. This GitHub page provides the source code.
Can I choose which Firefox data syncs?
Yes. After setting up Sync, you can choose supported categories such as bookmarks, history, open tabs and passwords for each device.
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