To add programs, use the program manager under the System folder… It slips my mind right now what ubuntu calls their installer, but you’ll see it under system.

You will be able to install firefox from that menu… it would be a good learning experience to give it a try… Just open up the package manager and “Update” to get all the packages, then you can do a search for FIREFOX, check the box, and tell it to install… It will install firefox, as well as any packages that are required for firefox to run… That is one thing that is different than in windows… Windows installer programs almost always contain the required “sub components” or “prerequisite” programs needed. In linux, certain programs “assume” that those prerequisite packages are already installed… What a “package manager” does in a linux distribution is keep track of what prerequisite’s each program has, and it will automatically select and install those packages along with the program you are installing, making it quite automatic in most instances.