[Jach]

I thought this might have been some Steam tie-in or otherwise not a Firefox built-in feature, never clicked it.. and now I can't even try it as the button's not appearing, it seems pretty unstable. Not that I really want to... This solves a problem I've never had. What's so hard about moving the video to a new window, or if your screen is too small moving the window to a new monitor? In Linux you can also make the window smaller to just have the video visible and then make it "always on top" of whatever else you're doing.