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The purpose for Mozilla moving away from the pad-lock in the first place was that the lower level certificates were to often being used by phishing sites to defraud people. The pad-lock made people feel safe when indeed they were not. Looking for the pad-lock has become an insufficient way of ensuring that you are conducting a safe transaction.
This being said, providing a blue bar to a lower level certificate creates the same problem. The only way to truly solve this would be to eliminate any form of visual (or other) indicators that the site is secure unless there is a mid or top level SSL attached to the site.
If you are still looking for the pad-lock and JUST the pad-lock it is only a matter of time until your information is stolen. Be sure to look for the identity information associated with the certificate and site as well.