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MercuryFirefox
Free

Free and open source.

 Free

Free software from a non-profit-owned foundation. Mozilla sells separate subscription…

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS
  • Compiler-optimized Firefox builds
  • Privacy patches drawn from LibreWolf, Waterfox and IceCat
  • Total Cookie Protection stops cookies following you between sites
  • An engine that is not Chromium, which matters for the health of the web
  • Maintained by a single developer
  • Updates can trail official Firefox releases
  • A small number of sites are still built and tested only against Chromium
  • Mozilla’s revenue comes largely from a search deal, which shapes some defaults
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 Works offline

Checked September 23, 2026

Checked September 20, 2026

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