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Firefox vs Zen Browser: catalog facts
Firefox	Zen Browser
Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…	Free Free and open source, funded by donations.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux
Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web	Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work
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	Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 21, 2026

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