Never heard of the Vivaldi browser until I needed a browser that focused the address bar on a new tab in Samsung DeX. They are apparently on the ball when it comes to Android.
Sadly (due to them being a chromium-based browser), they are ahead and more performant of nearly everyone else in the mobile space. If they enabled the ability to use extensions, such as Kiwi (another chromium mobile browser), or Firefox, they would certainly be king.