Rated 4 out of 5 stars

awesome. Suggestion: somehow (and I know it's hard) center the picture in the header pane vertically, and maybe add a little border. Also, clicking on the face could open the address book card for that person maybe?

This review is for a previous version of the add-on (0.1.2). 

Re: Suggestion

I was able to put the picture near the vertical center in 0.1.3, but there is some dead space between the image container and the bottom spacer.

There is now a border that you can customize through the Preferences dialog and clicking on the image will open the Edit Contact dialog or ask you to add the contact to the address book first.