Since version 10 of firefox, I see, the "Remote XUL Manager" malfunctioning. Overlays on the XUL sites do not work anymore.
With version 9 of firefox my sites written in XUL have no problem. Since version 10 of firefox, I see, the "Remote XUL Manager version 1.1.1" malfunctioning. Overlays on the XUL sites do not work anymore.