http://www.xulplanet.com/tutorials/xultu/menubar.html http://www.xulplanet.com/reference/elemref/ref_menubar.html A container that usually contains menu elements. On the Macintosh, the menubar is displayed along the top of the screen, and all non-menu related elements inside the menubar will be ignored. nsIAccessibleProvider Returns the accessibility object for the menubar. When set to true, the grippy will be hidden. When set to false, the default, the grippy will be shown. If you set this attribute to the id of a statusbar element, the label on the statusbar will update to the statustext of the items on the menu as the user moves the mouse over them. Gets and sets the value of the statusbar attribute.