Viewing by clicking on the lock icon has been on the wishlist for a long time, but has yet to be implemented. As of right now, the only thing you can do is go to Tools-Preferences-Security-Manage Certificates-Authorites-Select each one (or just one if you know what it is for that site)-View and put checkmark in Warn Me Before Using This Certificate. Then you will get a warning on the site that shows you the info you want.