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Serpent vs Pale Moon: catalog facts
Serpent	Pale Moon
Free Free to download.	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows	Windows, macOS, Linux
Runs on Windows XP and later Builds are GPG-signed for verification	It keeps the pre-Quantum Gecko engine and the old XUL extension model, so add-ons that Firefox dropped still…
Unofficial builds with no upstream affiliation Distributed as archives in a bare file directory with no installer	The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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