I'm still on Mojave, tried to use the latest update of Opera, a few windows opened, all Opera ones, then within a couple minutes it all froze, ran up 100% of CPU usage, and I had to force quit it to close. This has what I've been dealing with for the past few upgraded versions. No matter what I do, I can't get it to just work! No problems like this with any other browser I use, just Opera. So frustrating, as I would like to use it, but it's become completely dsyfunctional.