Rated 4 out of 5 stars

Nice work, thanks a lot. Just curious if you'd considered crowd sourcing with this add-on? If Certificate Patrol made use of crowd sourcing and made publicly available the oldest known valid cert for any organization, so that it can be compared to the one a visitor just loaded on first visit to a site, that might be pretty useful as if the cert is already swapped that visitor who came later is not going to know.

This review is for a previous version of the add-on (1.3.1). 

Crowd decentralized

'Perspectives' does something of that sort, but it does so using preset servers at cmu.edu. What we would need is some DHT and/or P2P features built directly into Firefox so that we could do anonymous crowdsourced certificate look-ups as one out of many applications of such an infrastructure. We also thought about announcement channels where certificates are announced, but how would we filter which ones could be of interest to you without exposing your browsing habits?