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r3dfoxBasilisk
Free

Free and open source, based on Firefox's Mozilla Public License code.

 Free

The open-source application is available without a license fee.

Windows Windows, macOS, Linux
  • Runs a current Firefox engine on Windows Vista and 7
  • Follows recent Firefox releases
  • Runs classic XUL extensions that no current browser supports
  • Independent of Chromium and of current Firefox
  • Small community project dependent on a few maintainers
  • Windows only
  • Small development team, so security fixes and web compatibility lag
  • Many modern sites do not work correctly
Downloadable app Downloadable app
Open source Open source
License: MPL-2.0 License: MPL-2.0
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.