[CentOS] Yum Update Errors

Afternoon All,

Just ran yum update and it burped on the following:

Package xulrunner.i386 0:1.9.2.20-3.el5_7 set to be updated
--> Processing Conflict: firefox conflicts xulrunner >= 1.9.2.19

firefox-3.6.18-1.el5.centos.i386 from installed has depsolving problems
  --> firefox conflicts with xulrunner


Uname -a gives:
Linux  2.6.18-274.el5 #1 SMP Fri Jul 22 04:49:12 EDT 2011 i686 i686 i386 
GNU/Linux

I have never had any troubles updating my box before.  Anybody else seen 
this yet? Or what am I doing wrong.  Just woke up, please cut me some 
slack.

Thanks.
Lee Perez