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r3dfox vs Arctic Fox: catalog facts
r3dfox	Arctic Fox
Free Free and open source, based on Firefox's Mozilla Public License code.	Free Free, with the source code published on GitHub.
Windows	Windows, macOS, Linux
Runs a current Firefox engine on Windows Vista and 7 Follows recent Firefox releases	Runs on old systems such as Mac OS X 10.6, Windows XP and PowerPC Linux Backports security fixes from Firefox and TenFourFox
Small community project dependent on a few maintainers Windows only	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
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 1, 2026	Official website Full listing and sources Checked October 2, 2026

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