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GNU IceCat vs Firefox: catalog facts
GNU IceCat	Firefox
Free Free software from the GNU Project with no paid tier.	Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…
Linux	Windows, macOS, Linux, Android, iOS
Contains only free software, with no nonfree add-on recommendations LibreJS blocks nonfree JavaScript	Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web
Blocking JavaScript breaks many modern sites until you allow scripts Builds are distributed from a third-party download page	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
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

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