Rated 4 out of 5 stars

Your extension can be even better if you add "Location", "State" and "Country data", since this information is always available but not shown by default in Firefox (only on EV SSL certificates).

Example:

L = Mountain View
ST = California
C = US

L = Scottsdale
ST = Arizona
C = US

Great extension! thank you.....

This review is for a previous version of the add-on (0.26). 

location information added in v0.31

Thanks for the suggestion. It took a bit of time to figure out, but the location information for the subject (website) and the certificate authority is in the drop down box. Most companies have the info and most small site or cheap ssl certificates do not. Again thanks for the idea!