Whenever I access my router at https://192.168.1.1 firefox complains that the security certificate is invalid. No amount of permanently storing an exception seems to change its mind. Is there something I can do manually to address this?
You should try connecting to https://routers.dns.name instead of https://ip-address. You may be able to find the router's DNS name by viewing the certificate details, and looking at the "issued to" "CN" section