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Serpent vs r3dfox: catalog facts
Serpent	r3dfox
Free Free to download.	Free Free and open source, based on Firefox's Mozilla Public License code.
Windows	Windows
Runs on Windows XP and later Builds are GPG-signed for verification	Runs a current Firefox engine on Windows Vista and 7 Follows recent Firefox releases
Unofficial builds with no upstream affiliation Distributed as archives in a bare file directory with no installer	Small community project dependent on a few maintainers Windows only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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