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Firefox ESRSeaMonkey
Free

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

 Free

The software is free under its open-source licence. Hosting, hardware and external…

Windows, macOS, Linux Windows, macOS, Linux
  • Long-term stable feature set for managed deployments
  • MSI and PKG installers plus group policy templates
  • It is the continuation of the old Mozilla Application Suite, so browsing, mail, news and page editing live…
  • New features arrive later than in regular Firefox
  • Mainly aimed at organisations rather than home users
  • It tracks an older Firefox codebase, so web compatibility and security hardening trail the current browsers.
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 22, 2026

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