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> it remained logged in across private tabs.

If you mean "Incognito mode", then that's always happened. You need to close all tabs.

Exactly the same for FireFox's private browsing.

I don't use Chrome/Firefox but this surprises me, as well. The presence of a private browser window (anywhere) will prevent it from deleting cookies when you close this private browser window? That seems completely counterintuitive to me. When else, in any application, does the mere existence of an open, empty window completely change the behavior of a different window?

Safari's private tabs are each completely independent.

> The presence of a private browser window (anywhere) will prevent it from deleting cookies when you close this private browser window?

Yes. This is not new behavior. And yes, it frustrates people that assume each window is a separate incognito instance. It's not, and hasn't ever been.

> Safari's private tabs are each completely independent.

What happens when you middle click a link on a page that requires login?

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