@leocg Great! Island tabs might be the one feature that makes me switch to Opera from Chrome as my regular browser. I will have to use it awhile (and explore what else Opera has to offer) before deciding for sure, but this is a welcome idea.

If I close Opera (or it crashes), will my previously created tab islands be restored when I reopen it?

I am creating tab islands to group related websites that I use often, for example, those related to my various banking and investment activities. However, I would not want to go to all that trouble if I stand to lose them when Opera is closed.