You don't need to know anything about programming to install firefox
However, the easiest method available to you will really depend on what version of linux you're running, so providing us with that information will help! You could however try:
sudo apt-get install firefox
...which works on a number of popular distros, Ubuntu included.
As a bit of background, installing packages in linux is very different from windows - dare I say far better. With the vast majority of applications you don't need to visit the site or download anything manually at all - instead you have a package manager available that "knows" how to retrieve and install thousands of the most popular packages around (firefox included.)