Yeah I'm missing this function too.
Seems like it's something they removed outright..

I hope they bring it back, otherwise I think I'm just going to have to find an alternative extension..
It's a shame.. this one did exactly what I wanted it to until now.

I'm sorry but.. how is this better than the original feature?
I personally don't like having to remember hotkeys, it always made perfect sense to be able to throw whichever window I wanted to another screen simply by clicking the icon.
I'm genuinely baffled that this option has been removed.