Kind of disappointed that no-one has an answer to this. And was hoping that @Katherine_Duh herself might respond.

Unfortunately, the fact that an in-app message will appear in multiple windows/tabs if you have multiple windows/tabs open is a limitation of the software that we use to broadcast the in-app messages (Intercom), and I don’t think there’s an easy way for us to solve it at the moment. I wish I had a better answer for you. In the meantime, I can prevent you from getting any in-app messages at all by putting your name on the opt-out list, but I can’t force in-app messages to only appear in one window.

Thanks Katherine, understood.

For clarity, for me the (minor) annoyance is not a multiple window issue. It’s that the messages re-appear with every new browser session.

I can live with it. Seems like Intercom should offer you something better though