since the last Firefox update I have receiving this message on my Bitdefender antivirus, so what is happening? How do I fix this? I alredy uninstall and re install firefox thre times and still happening. firefox.exe attempted to establish a connection relying on an unmatching security certificate to content-signature-2.cdn.mozilla.net. We blocked the connection to keep your data safe since the used certificate was issued for a different web address than the targeted one. Add to exceptions