[CentOS] firefox or mozilla won't start

Greetings
When I start firefox or mozilla I get an  hourglass for 3 seconds then
nothing happends.
Dropping to a terminal and typing firefox just returns to the command
line. I re-installed
firrefox and it installs fine until I quit then the same situation happends. 
After re-installing firefox it will run but the same situation happens
where it won't start.
I have installed int my home directory or into /usr/local/firfox. 

( Cent OS 4.0 with all patches applied. Firefox 1.0.2 )

Ideas?

Thanks
-Jay