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I guess multi PiP makes sense. But I'd really like to be able to show any element in PiP, not just videos

Actually, what I'd really like is to be able to use PiP through the standard https://developer.mozilla.org/en-US/docs/Web/API/Picture-in-... at all

I used to have an add-on that did exactly this. Don't know if it made the Web extension jump.