Description of problem:
I've started firefox first time and try to login to freeipa web ui. It showd a message "You kerberos ticket is not valid ...", i've clicked link 'follow this directions', imported certificate successfully and got to page with button "Configure Firefox". I've clicked it and got error message "Unable to store preferences: TypeError: navigator.preference is not a function"


Version-Release number of selected component (if applicable):
freeipa-admintools-2.0.0.rc1-0.fc15.x86_64
freeipa-client-2.0.0.rc1-0.fc15.x86_64
freeipa-server-2.0.0.rc1-0.fc15.x86_64
firefox-4.0-0.16.b11.fc15.x86_64
freeipa-python-2.0.0.rc1-0.fc15.x86_64
freeipa-server-selinux-2.0.0.rc1-0.fc15.x86_64

How reproducible:
always

Steps to Reproduce:
1.install freeipa and configre freeipa server
2.run firefox and go to http://localhost
3.click at the link 'follow this directions' and follow the instructions ...
  
Actual results:
Firefox configuration script doesn't work

Expected results:
firefox correctly configred for using freeipa web ui

Additional info: