I disagree with that. The browser already does too much "window management" already. I like that it pops out a separate window that I can do with what I please rather than being limited to whatever window management functionality they decide to add to their internal "window".
Possibly - but in my case the windows was just floating on top of all of my other windows, and whilst I could move and resize it, I could not move it like other windows.
So popping out a new firefox window that operates like a normal window would be great, but the current solution seems like the worst of both worlds.
Also on an unrelated note, seeing your username we used to work together - hope all is going well :)
Do you happen to use sway? (Or maybe just Wayland in general does it..)
I'm using a tiled window manager on X and was rather confused by other comments here, before realizing my window manager must be giving me unintended control over the video popup. I just get a floating window that's fully draggable and resizable identically to other windows.
I'm using Gnome actually. I have found that Wayland tends to keep some apps in check so maybe the less options that Wayland provides to clients is helping me here.