lockPref("media.eme.enabled", false);
lockPref("media.gmp-provider.enabled", false);
lockPref("media.gmp-manager.url", "data:text/plain,");
lockPref("media.gmp-manager.url.override", "data:text/plain,");
lockPref("media.gmp-manager.updateEnabled", false);
lockPref("media.gmp.trial-create.enabled", false);

lockPref("media.gmp-widevinecdm.visible", false);
lockPref("media.gmp-widevinecdm.enabled", false);
lockPref("media.gmp-widevinecdm.autoupdate", false);

lockPref("media.gmp-gmpopenh264.enabled", false);
lockPref("media.gmp-gmpopenh264.autoupdate", false);
defaultPref("media.peerconnection.video.enabled", false);
//lockPref("media.peerconnection.video.h264", true);
lockPref("media.gmp-eme-adobe.enabled", false);
lockPref("media.gmp-manager.certs.2.commonName", "");
lockPref("media.gmp-manager.certs.1.commonName", "");