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Wait can you do a pop out window? That way it's always open and can't have multiple tabs. The main tab can control the pop out to kill the data channel ...

Minimising still suspends. And IMO pop-ups are slightly user hostile compared to just staying in the tab.

Have you tried popping up a message in other browsers saying 'userBob switched browser tabs, disabling his host. Please contact userbob to switch back and always remeber if you are the host, dont switch tabs.' Then it would only happen when people were trying to be hostile or negligent.

Also have you tried with a webworker or something similar.

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