In Cert Mgr., click Restore. After you pick the file to restore and enter your master password, you see a dialog with this text: Please enter the portable security password protecting this security certificate and private key. For consistency with the fix in bug 76736, this should read as follows: Please enter the certificate backup password protecting the backup you want to restore. I believe the backup file could contain a single cert or several. This wording should work for either case.
Hmm, sorry about the dupes. Note sure how this happened. *** This bug has been marked as a duplicate of 85993 ***