Sorry about late answer, but Firefox Kerberos authentication works out- of-the-box on Feisty with heimdal-clients and no heimdal-dev installed on this system.
-- GSSAPI unavailable, missing library https://launchpad.net/bugs/41076 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
