Here is a quick guide on how to get Webex working on Fedora 16. This guide is for FIrefox only. I took this info from hxxp://troshlyak.wordpress.com/2010/08/26/webex-on-64bit-fedora-13/ and cleaned it up a bit.
Let me know what you think.
setarch i686 yum install firefox
yum reinstall firefox
setarch i686 yum install java-openjdk java-openjdk-plugin
yum reinstall java-openjdk
yum reinstall icedtea-web
setarch i686 yum install libXmu
yum reinstall libXmu
If you get any dependancy errors when you try to install Firefox this may work for you.
yum check all
yum clean all