lockPref("network.trr.mode", 5);
lockPref("network.trr.bootstrapAddress", "");
lockPref("network.trr.uri", "");
lockPref("network.dns.disableIPv6", true);
lockPref("network.dns.disablePrefetch", true);
lockPref("network.dns.disablePrefetchFromHTTPS", true);