Actually the whole point of Firefox OS is that you don't target the desktop anymore. So the answer is that you can't do that in Firefox without actually releasi

Actually the whole point of Firefox OS is that you don't target the desktop anymore. So the answer is that you can't do that in Firefox without actually releasing an app packaged to run standalone. Some other service that don't contain the full packaged app create a glorified bookmark which redirects you to the website's service like SoundCloud does.