Welcome to LQ!
For firefox, just extract the file you downloaded using:
Code:
tar -xzvf firefox-1.5.0.6.tar.gz
Change to the directory that was created. There should be an executable in there called "firefox", which you can run using:
from inside that directory.
Installing programs on Fedora is generally done using Yum. This is a program that will fetch and install programs and dependencies for you. I think Synaptic is installed by default on Fedora, which is a very good graphical frontend for Yum. If not, install it using yum (as root):
Code:
yum install synaptic
One other thing, a .tar.gz is the linux equivalent of a .zip file in Windows.
I hope this helps
--Ian