See also https://vivaldi.com/press/releases/2016-04-06-vivaldi-1_goes_final/
Interesting project, but it really just seems like Chrome/Chromium with a different UI. I really liked the old Opera, IIRC it’s dev tools were better than any others available at the time.
Tried it, liked it, but not open source or free software so no-go for regular use. I know this sucks and is shitty, but I really cannot let one of the three core tools of my work be out of my control. I’d happily contribute to a fundraiser to get the software freed.