I found out about profiles recently and I just couldn't believe that that's the standard way to access them. Also, it's not obvious which profile you are currently on, so there are some silly but necessary workarounds like having a dummy bookmark with the profile name on each or something like that, while it could just be a string next to the address bar.

It works really well though. Does exactly what I would expect and hope from such a feature.

I have different coloured themes for my profiles. Simple and immediate.