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LibreWolfMercury
Free

Free and open source under the MPL 2.0, maintained by volunteers.

 Free

Free and open source.

Windows, macOS, Linux Windows, macOS, Linux
  • Deletes cookies and website data on close by default
  • Ships uBlock Origin with custom default filter lists and strict tracking protection
  • Compiler-optimized Firefox builds
  • Privacy patches drawn from LibreWolf, Waterfox and IceCat
  • The aggressive defaults break some sites and log you out every time you close the browser
  • Resist Fingerprinting changes timezone and window size reporting, which confuses a few web apps
  • Maintained by a single developer
  • Updates can trail official Firefox releases
Downloadable app Downloadable app
Open source Open source
License: MPL-2.0 License: MPL-2.0
No account needed No account needed
Works offline Not stated if it works offline

Checked September 20, 2026

Checked September 23, 2026

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