Vivaldi browser hits 1.0 vivaldi.com/press/...
Oh, neat. Have you tried it? Is there an option to disable UI recolouring?
If you mean the color of the tab/chrome changing per website? Yes, you can do that in Settings > Appearance > Uncheck "Use Page Theme Color"
Cool. I loved Opera before they ditched Presto and moved to Blink (and lost a ton of features), hopefully they managed to capture all the good parts in Vivaldi.