Updated to firefox9.Using tree style tab extension.Everything works fine,except my screen goes black when in "tab window",except for the tab window and the part of the screen behind it.Once out of the tab section everything comes back fine,but it is rather annoying.Have checked homepage for the extension and do have the up to date version,also firefox add-on page says it is compatible.Any thoughts on this?

 Am realizing pages will stay on as long as I don't move the mouse,but as soon as I do move it,black goes the screen.