Hi! Quoting "Matej Kovacic" <matej.kovacic@xxxxxxxxx>:
My question is - is there a plugin for Firefox, which saves info about certificate of a website. When user comes back next time, plugin should check prevous certificate and the new one. If there is change, it should raise alarm.
I am not 100% sure if this is what you are searching for, but maybe you may have a look at "Perspectives". You will find informations on [1]
Greetingx! [1] http://www.cs.cmu.edu/~perspectives/