My experience of it : in Darktable (photo editing software) when you hover over some area, a ballon tip is displayed. When the tooltip is displayed, the shadow of a transparent top panel appears.
I have no problem with fullscreen Firefox, but I think this is related and might help.
My experience of it : in Darktable (photo editing software) when you hover over some area, a ballon tip is displayed. When the tooltip is displayed, the shadow of a transparent top panel appears.
I have no problem with fullscreen Firefox, but I think this is related and might help.