Best way to connect to multiple Azure/Office 365 client portals

Hi, i'm trying to figure out how to add https/http sessions and connect to multiple Azure portals at the same time. When I connect to one client portal, I can auth with the inherited credentials.. but when i try to bring up another portal's interface simultaneously, the software will just login as the previous client's admin.

Is there a way that anyone knows of to have multiple portals running through IE or Chrome or FF? Maybe an option to force Private browser mode?