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Pale Moon vs Serpent: catalog facts
Pale Moon	Serpent
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free to download.
Windows, macOS, Linux	Windows
It keeps the pre-Quantum Gecko engine and the old XUL extension model, so add-ons that Firefox dropped still…	Runs on Windows XP and later Builds are GPG-signed for verification
The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…	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.