execute the firefox bin file
Not quite correct.
Firefox is started with the script 'firefox'.
.. You may miss some dependencies.
.. Also required by Firefox-3.0.14, which you can get with
# yum install firefox
( or with 'up2date' ).
The dependencies are described is this thread :
The text : export LD_LIBRARY_PATH=/usr/evolution28/lib
can be added to the ( empty ) line 49 in firefox/firefox
.. to find / use those libraries.