[CentOS] Alternative HTML Editor

My bad for fogging things up. Besides the epel rpm, I had also tried the
(non-rpm) tar file from mozilla of the latest beta release (installed in
/usr/local).  That turns out to be a 32-bit version.  The epel rpm is
clearly 64-bit.

   Well if you are still seeing the same error then the only think I can
think of is that elements of your install in /usr/local are conflicting
with the RPM version.  If you haven't already completely remove the
/usr/local/ instance.