A menu item has a fixed height. Please prevent from defining too long text as a menu item. Set a 'width' style to a menu to limit the menu width.
<div style="width:150px">
<div>Address</div>
<div>Link</div>
<div>Navigation Toolbar</div>
<div>Bookmark Toolbar</div>
<div class="menu-sep"></div>
<div>New Toolbar...</div>
<div>000020: ork loin pork chop ...</div>
</div>