var certdb = Components.classes["@mozilla.org/security/x509certdb;1"].getService(Components.interfaces.nsIX509CertDB);

I have an autoconfig (.cfg file) script which adds a trusted certificate into firefox as displayed in https://mike.kaply.com/2015/02/10/installing-certificates-into-firefox/. The certificate gets installed correctly in every Firefox version from 35 to 42. There's a small "side" anomaly, for Firefox >= 40: Firefox doesn't show the certificates list in "options" -> "advanced" -> "certificates" -> "view certificates" when the line var certdb = Components.classes["@mozilla.org/security/x509certdb;1"].getService(Components.interfaces.nsIX509CertDB); is uncommented. Unfortunately, when that line is missing, no certificate gets installed. If the line gets commented, Firefox lists the certificates, which include also the one registered through autoconfig. Is this secondary anomaly a firefox bug? Is Firefox dropping support to this function over time? Thank you