This isn't working because it needs to update both i386 and
x86_64
versions of mozilla at the same time. Did you bugzilla the fact that
there is no mozilla.i386 update in the x86_64 updates-released repo?
To work around this you'll need to do:
# yum remove mozilla.i386
# yum update mozilla
Then, if you do actually want the i386 mozilla package (for 32 bit
plugins etc.):
# yum install mozilla-nspr.i386 mozilla-nss.i386
After removing the mozilla.i386 package a plain "yum update" updated the
complete system. I did not reinstall mozilla.i386 since I do not see why
I should neet it. Maybe some program will complain about that but I can
reinstall it later. "yum install libtool" also succeeded.
Thanks for going through all the effort to solve my problem!