I figured that I would post this in case someone may know the answer. I have a small server at home that is using a self-signed certificate. Firefox used to give a warning about this and then let you accept the certificate. However, newer versions just block the site without being able to override the warning. I did find a fix that required you to install an older version of Firefox, go to the site, override the warning and then install the newer version of Firefox. That worked great at home but I don't have that kind of administrative access on one of my work computers. I suspect that there is something being set in my profile that is saving the overrides. If so, I should be able to copy that to the profile on my work computer. However, all of my searches have turned up nothing. The best resource that I've found so far is this one describing where Firefox stores profile data. Unfortunately, I haven't had any success yet. Does anyone know which file may have this data so that I might be able to copy it from my other computer?