When upgrading to Firefox 4 you may find that the menu (File, Edit, View etc) and the “Address bar” are no longer visible, at least on Windows 7.
Firefox 4 Address Bar Broken? Always Blank?
Some, like me, have taken the “Navigation toolbar” for the “Address bar”, and thought it was broken (always blank). . . . → Read More: Firefox 4 Missing Address Bar / Menu Bar