Google Chrome has this feature we all know, and is perfect. But, Vivaldi also has this feature which looks like it is similar to google chrome, but it is very forceful of sort. Example, in Vivaldi if you open a new window with "Profile 1", it also loads "Profile 2" and all its extensions, opened pages and data.
This is an Important feature and hope Opera will implement it as quickly and as perfect as google has done. And, if the team is already working on it, we would be glad to know that.