Make the popup moveable
I saw that you fixed the issue with the button on firefox but I use Opera and do not see the button, instead I get a popup. This might also happen again in other browsers should yt choose to mess with the layout again.
I do not mind at all but it would be helpful if I could move the popup somewhere so that is is not hanging over my playlist and I can still see what will play next. I do not know if I want to download a video when it starts playing, so I want to keep the dialog open but move it to a place where it does not bother me.
Alternatively, you could add an icon to the tools bar in opera but I do not see one there and did not find a setting to make it visible.