This is awesome. Microsoft's identity system is a nightmare so switching between my Office 365 email account and my OneDrive/music accounts is always annoying. I'd love to be able to contain each and stay logged in to both accounts.

At work I test lots of user accounts on the same site and make heavy use of Chrome profiles for that. This would fill a similar role.

But while I'm glad to have them, no average user would ever understand any of these concepts as presented in these screenshots.