Enabling Kerberos Authentication in Firefox
Firefox does not automatically perform Kerberos authentication against any sites. You must manually add sites to a trusted sites list.
To enable Kerberos authentication in Firefox:
Open Firefox and enter about:config in the address bar. Dismiss any warnings that appear.
In the Filter field, enter negotiate.
Double-click the network.negotiate-auth.trusted-uris preference.
This preference lists the trusted sites for Kerberos authentication.
In the dialog box, enter the PeopleSoft domain, such as example.com.
Click the OK button.
The domain that you just entered in the network.negotiate-auth.trusted-uris should now appear in Value column. The setting takes effect immediately; you do not have to restart Firefox.