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Pale Moon vs Arctic Fox: catalog facts
Pale Moon	Arctic Fox
Free The software is free under its open-source licence. Hosting, hardware and external…	Free Free, with the source code published on GitHub.
Windows, macOS, Linux	Windows, macOS, Linux
It keeps the pre-Quantum Gecko engine and the old XUL extension model, so add-ons that Firefox dropped still…	Runs on old systems such as Mac OS X 10.6, Windows XP and PowerPC Linux Backports security fixes from Firefox and TenFourFox
The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…	Based on an old Pale Moon engine, so modern sites may not render well Often has to be built from source on less common platforms
Downloadable app	Downloadable app
Open source	Open 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.