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Firefox NightlyFirefox Developer Edition
Free

Free and open source.

 Free

Free to download and use.

Windows, macOS, Linux Windows, macOS, Linux
  • Earliest access to new Firefox features
  • Updated daily
  • Newest developer tools before they reach stable Firefox
  • Builds for Windows, macOS and Linux, including ARM64
  • Pre-release builds can be unstable
  • Not suited as a main browser for most people
  • Pre-release software, so it can be less stable than the regular release
  • Not supported on Windows 8.1 and older or macOS 10.14 and older
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 September 24, 2026

Checked September 23, 2026

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