<menubar>

<menubar> is the top-level widget in the definition of a XUL menubar. Browsers and other XUL applications may contain any number of menubars. Typically, a menubar contains a number of menus (e.g., File, Edit, View, etc.), each of which defines a menu of commands available to the user. But menubars may have other elements as children as well. Like toolbars, menubars can contain almost any XUL elements as children. The menubar inherits from the basic box element.