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BasiliskSeaMonkey
Free

The open-source application is available without a license fee.

 Free

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

Windows, macOS, Linux Windows, macOS, Linux
  • Runs classic XUL extensions that no current browser supports
  • Independent of Chromium and of current Firefox
  • It is the continuation of the old Mozilla Application Suite, so browsing, mail, news and page editing live…
  • Small development team, so security fixes and web compatibility lag
  • Many modern sites do not work correctly
  • 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
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 22, 2026

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