My favorite alternate browser right now is Vivaldi [1]. It's made more for power users with a lot of customization options. It's built by Opera's former CEO.
? Where did you see more customizable options in Vivaldi. Their technical preview is just basically a Chrome reskin and a very clunky reskin, for that matter.
Well they're still doing a better job at it than Opera is and functionality wise it seems fairly close to old Opera releases(Vertical Tab, Sidebar...).
Features include customizable mouse gestures, tabs on the left/right/top/bottom, tabs with preview, tab stacking, tab page tiling, black color theme, custom shortcut keys, web panels, speed dial, etc.
[1] https://vivaldi.com