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r3dfoxFirefox ESR
Free

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

 Free

Free and open source; Mozilla offers optional paid professional support for organisations.

Windows Windows, macOS, Linux
  • Runs a current Firefox engine on Windows Vista and 7
  • Follows recent Firefox releases
  • Long-term stable feature set for managed deployments
  • MSI and PKG installers plus group policy templates
  • Small community project dependent on a few maintainers
  • Windows only
  • New features arrive later than in regular Firefox
  • Mainly aimed at organisations rather than home users
Downloadable app Downloadable app
Open source Open source
License: MPL-2.0 License: MPL-2.0
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 24, 2026

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