Mozilla's choice to add their own pip button is a massive pain for anyone developing video applications - anywhere over the player can't be considered a safe space to add our own buttons anymore, it really feels like Mozilla didn't talk to any video service developers when deciding how to approach this problem.

Pip needs to be common API driven (as Chrome is) to make building portable video applications possible.

A terrible misstep from Mozilla. (And yes, this has been repeatedly raised on the bug tracker with no answer)