Update check Rated 5 out of 5 stars
Please check out this site http://codefromthe70s.org/sslblacklist.aspx , because it also has a sslblacklist-localdb-1.0.8.xpi which uses a local database to detect bad certificates, instead of relying apon DNS responses, which can be fooled while the local database can't be! The local database one has to be installed second after the first one is installed!!
PS: Everyone should use the UpdateNotifier addon, which updates all addons and themes of your Firefox edition so you don't have to.