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Vivaldi vs Firefox: catalog facts
Vivaldi	Firefox
Free Free, funded by default search engine and bookmark placement deals.	Free Free software from a non-profit-owned foundation. Mozilla sells separate subscription…
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel	Total Cookie Protection stops cookies following you between sites An engine that is not Chromium, which matters for the health of the web
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	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
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 20, 2026

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