I switched to Firefox when Opera ditched Presto and mouse gestures were the thing I missed the most (along with windowed tabs). Took me a long time to stop trying to use them, those commands were etched deep in my muscle memory. I remember trying a few extensions but they never managed to replicate how smoothly it worked in Opera.

You can tell the Vivaldi devs care about that kind of stuff. I don't want to use a chromium-based browser as my daily driver, but I like a lot of what they're doing.