@leocg Because the youtube is sandboxed in its own individual Tabs, (NOT a seperate "profile" window, this is done in tabs ~amazing) no matter if you have 4 tabs with youtube open they are all in the same "sandbox" container. If you visit google search in another tab, it does not knwo you have signed into youtube in another tab. The absolute best feature is the facebook container, which keeps facebook from spying on your browsing activity.
We absolutely need this. Please just use firefox for one day and you will know A: how annoying it is, but B: that the container function is revolutionary. So please lets get it for Opera.
Suggestions and feature requests