Add a PIP option for essential tabs, not just video

[dilroopg]

Like a resizable always on top pip window that can be opened for active essential tabs, like if i want a chat always up off to the side or in view while waiting for a response, it could just be a visual, but ideally i'd be able to click in it like any other window. I basically already do this with youtube since it has pip for videos, would be nice if it also worked with mail, cloud drives, social media, etc.

Basically the functionally would be similar to having a borderless window open with just one tab that is always on top.