I'm not familiar with Opera, but it seems like you might be looking for something like Tree Style Tab.
this post was submitted on 22 Nov 2023
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thanks! I've tried this but in the end its just a different way of displaying but i want groups to be contained differently as well
Firefox has a concept that is called containers, but it's less a visual separator and more of a logical isolation layer (with separate cookies, etc.). Maybe this could work for you? I believe you can make different containers have different tab colors, but I'm actually not sure about that.