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Firefox Developer EditionFirefox Nightly
Free

Free to download and use.

 Free

Free and open source.

Windows, macOS, Linux Windows, macOS, Linux
  • Newest developer tools before they reach stable Firefox
  • Builds for Windows, macOS and Linux, including ARM64
  • Earliest access to new Firefox features
  • Updated daily
  • 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
  • Pre-release builds can be unstable
  • Not suited as a main browser for most people
Downloadable app Downloadable app
Open source Open source
License: MPL-2.0 License: MPL-2.0
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 24, 2026

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