I remember trying Opera for the first time in Windows 98 SE. It was one of those versions that prided itself for fitting on a floppy. I think it was 3.0.6 or 3.6. But anyway I was taken by surprise how good it was in comparison to Internet Explorer which at the time was the only browser I ever used.
Vivaldi is it's rightful heir https://vivaldi.com/
They had lots of cool featues built in:
IRC Client
Email Client
RSS Reader
Note taking (I used it a lot)
Gestures (those were awesome, I fondly remember holding left then right click and the other way around to move back and forward, but these proved to be a sign of Operas decline, some bugs with them were never fixed while we kept getting newe releases, (remember the potato ad?))
Sharing local files as a website right from your browser
They invented tabs
They might have had torrent support too, don't remember clearly.
It was fast even with all this.
Vivaldi's UI is built in JS, it feels slow, all my clicks are slow. I never got myself to using it more than a few minutes.