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Basilisk vs Serpent: catalog facts
Basilisk	Serpent
Free The open-source application is available without a license fee.	Free Free to download.
Windows, macOS, Linux	Windows
Runs classic XUL extensions that no current browser supports Independent of Chromium and of current Firefox	Runs on Windows XP and later Builds are GPG-signed for verification
Small development team, so security fixes and web compatibility lag Many modern sites do not work correctly	Unofficial builds with no upstream affiliation Distributed as archives in a bare file directory with no installer
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

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