Rated 4 out of 5 stars

I second bjacke: taking into account and displaying the key exchange protocol and whether Perfect Forward Secrecy (PFS) was used would be great.

Actually, I might be wrong but I think there is currently no way in Firefox to show which key exchange protocol was used. This information is available on vanilla chromium, for instance.

This review is for a previous version of the add-on (3.6.3.1-signed).