Hello, I'm running Firefox ESR 78.9.0 and using the mozilla configfile and GPO. We're using Webmarshal and needed to import for all of our user the SSL certificate. I succeeded and firefox now sees this certificate under the certificates, but firefox does not read it. For example, we have a block on facebook.com, but we can still access it, even though the certificate is in it. I found out that if I manually enter the socks host with ipaddress, my sites will be blocked, but I can't manage to put this in the config file. What I added: lockPref("network.proxy.socks", "servername.domain.nl"); lockPref("network.proxy.socks_port", 1234); But when I open firefox, it cannot read the confile file with these 2 prefs. I would like some support so that these sites are also blocked on firefox. They are now only blocked on Internet Explorer and Google Chrome. Thanks!