IIRC you are going to want this in the /opt directory with SuSE, even though by convention programs that you compile yourself would go to /usr/local. Whatever works for you. /opt is a sfae bet. So, with that in mind:
Code:
you@localhost:~$tar xvzf firefox-1.5.tar.gz -C /opt
Then, see the firefox script in the new folder? That is your new executable file to start Firefox. Do something like symlink to it, or create a launcher (usually draging the icon up to the panel (toolbar) creates one for you), or change your current launchers command to /opt/firefox/firefox.
Tada, Firefox!
HTH