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That creates a new window per Profile as opposed to just one window with a bunch of tabs, all conceivably in using their own Container, right?

How do you juggle multiple facebook / google / anything accounts in that sort of system?

Each container can be colour coded (up to 8 colours) and each tab is underscored with the same colour, so you can immediately see which is which.

The containers can be named and color coded. Also there are keyboard shortcuts which once learned makes it easier to switch.