https://www.cnet.com/news/vivaldi-mobile-browser-email-software-due-in-2019-q-a/

How configurable? In settings, you'll have to scroll to see all the options for controlling tabs, and that's just one of 17 pages for customization.

He's betting enough people will like that approach that they'll start running his browser, with their searches producing about a dollar per person per year through search-engine partnerships.