@jon One thing that bothers me with Vivaldi that Opera gets right is the way text boxes are treated. When I'm writing a forum post and change tabs, the cursor will remain where it was and I can just resume typing in Opera. Not so in Vivaldi, I always have to click into the text window again first.

Seems I'm not the only one: https://forum.vivaldi.net/topic/82108/vivaldi-doesn-t-return-focus-to-text-box-when-switching-from-one-tab-to-google-docs/6