If the Platform is now the Browser, I want context isolation - capabilities that have existed in the OS world for DECADES.  I want the capabilities to log into a site in one browser/tab as ckaminski, and to log into the same site in another browser/tab as ckaminski-admin.  I don't want to have to keep bouncing back and forth because the browser is pooling all my cookies/credentials.  I want true process isolation, or at least the capability for it.  As of right now, I have to go through major headaches to support multiple profiles in Firefox, and IE?  I have to have completely different user account to make that happen.