All versions of Safari on Mac OS XQuestion:
Does Safari support single-sign-on authentication via Kerberos?
(Sometimes also referred to as Integrated Windows Authentication)Answer:
As of OS X 10.8, Safari has been tested to support silent authentication out of the box and with no additional configuration needed.
Older versions of Safari did have the ability to do Kerberos authentication, however did not allow for delegation which is also needed for SSO to work.
For configuration of alternative browsers like Firefox, see: