Currently, when Firefox has downloaded a new Update, user can't see any indicator, that his browser is ready to apply an update. There should be at least small icon somewhere in browser or some other indicator (eg. highlight the Firefox Menu Button and add a new element on the Menu List) to show the user, that he can make an update. This would be very helpful especially for Nightly users. Looking at other browsers, Chrome shows a little icon on "Settings" button and adds a new element to this menu.