certutil -L -n <nickname> should be able to interpret and display all cert extensions that are understood by the NSS libraries. Likewise for the pp command. There should be no need to run a tool from another suite of crypto software to adequately display a cert's contents.
Target NSS 3.10, priority P2. Will assign to an appropriate person.
This bug is a dup of a much older bug, which was futured until yesterday. *** This bug has been marked as a duplicate of 132942 ***