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Firefox vs Vivaldi: catalog facts
Firefox	Vivaldi
Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…	Free Free, funded by default search engine and bookmark placement deals.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web	Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel
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	Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
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.