Hello guys, so i just got my new 13inch macbook pro today, and i love it, but being a PC user my whole life im kind of confused. When i download an application for example firefox, i get a .dmg and a disk appears in my desktop, usually in windows you run a setup and it installs, when i try to remove the icon from the mac desktop it tells me it cannot do so since its being used by firefox, i thought that when you install an application on the mac, its similar to windows in which you run the setup and thats it, im confused, can someone please explain to me how this works?