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Firefox vs Zervo: catalog facts
Firefox	Zervo
Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…	Free Free and open source under the MPL-2.0 licence.
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	Uses Servo rather than Chromium or Gecko Sidebar workspaces with several layouts
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	Some sites do not work because Servo is incomplete Linux and Windows builds are untested
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
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.