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Firefox vs Fast Internet Browser: catalog facts
Firefox	Fast Internet Browser
Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…	Free Installed from the Microsoft Store; the site does not mention a price.
Windows, macOS, Linux, Android, iOS	Windows
Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web	Runs on Xbox as well as Windows PCs Built-in ad blocker
A small number of sites are still built and tested only against Chromium Mozilla’s revenue comes largely from a search deal, which shapes some defaults	Users report slowdowns with more than four tabs open Developer and engine are not stated on the site
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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