After many years of using the Opera browser (since version 7.5, if I remember correctly), I finally switched to the Vivaldi browser. You don't even know what a relief it is! I couldn't stand this ugly Opera One Ui anymore! All those big rounds like in airplane windows, nightmarish bright purple accents, silly looking tabs, stupid new sidebar with buttons moved to the bottom (so ergonomic!), incorrectly scaled side panels...
Now I've got almost everything I had in Opera (I miss only the bookmark's page layout) plus great looking UI (they added themes so you can have nice icons finally!), properly integrated side-panels, notes, list of sites to read later (temporary bookmarks :)), vertical tabs (I don't like them, but they are here), more tab grouping options, no stupid audio pop-ups after update, browser UI scaling and proper main bar height... Can't even express how happy I am!