…you cannot scroll further down because the .ember-view .menu-panel .slide-in is too high. If you’re lucky and your device has a more pixles in y-direction, you can see the whole menu as usual:
Re-using this one since it’s closely related. On FF ESR 17, the menus become inaccesible when they go from drop-down to slide-in. You get neither any hover effects nor can you click the menus.