Hi! I currently have 2008 macbook with 10.6.6. Recently, bought MBA and upgraded to yosemite first thing. Love the new look. I have a simple question, hope it is not stupid In my 2008 MBP, when I install a program, let's say Firefox. I download the .dmg file, install it (move it to applications folder), and then can delete the dmg file, but firefox will still launch. However, in Yosemite, I installed the firefox same way, but then the firefox disc icon stays on the desktop. If I eject it, then next time when I want to use Firefox, I need to go through the same process all over again. If I try to eject disc icon when firefox is running, I get error message that firefox is using it and cant be ejected. I think there is something very simple that needs to be done, and I cant find it. I dont want that disc icon on the desktop once firefox is installed, and dont want to go through the installation process every time I want to use it. Can someone please guide. Thanks.