And thats a good idea I will try that.
Anyway maybe it will be a interesting option in future updates or someone could make an addon like that to Opera.

Hi. I was using Opera from many years and it was always my favorite browser. By time me and my wife we had to use different browsers to keep our bookmarks, opened pages and sessions. On every computer in home we had 2 installed versions of Opera- newest Opera for my wife and old Opera 13 for me. Finally it get to old so I started to use Vivaldi browser. Now I would like to get back to Opera so I would like to ask. Is there some way to use 2 Opera browsers by 2 different users on the same time ( maybe there is some addon like account/user manager or something like that?). I do not mean login/logout in Windows every couple minutes ( just to use them both on the same time as 2 different users). Hope You understand what I mean/ my wife must have open f.ex facebook and some 20 tabs with girl stuff when I have 3 open windows with my 20 important tabs.