How does Firefox determine where the Kerberos keytab is located? The default location for Kerberos keytabs on a Linux box is within /tmp. /tmp is '''''very''''' temporary these days and is wiped on reboot and it looks like on the various power save/restore. So, I decided to move the keytabs to a static location to allow them to work according to the usual schedules and timeouts, instead of being wiped out on a whim. I settled on '''''/var/lib/krb5tabs/krb5cc_%u''''' I configured that within '''''/etc/krb5.conf''''' I use pam_winbind from Samba to do the Kerberos login and the keytab is filled in and the environment var KRB5CCNAME is set correctly. Before the change of the location of the keytab from the defaults, everything works fine apart from after a resume and creds need re entering (which is the pain I am trying to avoid). After the change, Evolution is still able to authenticate via Kerberos but Firefox is not. So, does FF just assume defaults or actually follow KRB5CCNAME - which seems to be the standard for Kerberos?