Enhance refers security

user.js

@@ -197,6 +197,7 @@ user_pref("identity.sync.tokenserver.uri", "");
 user_pref("media.decoder-doctor.new-issue-endpoint", "");
 user_pref("media.navigator.enabled", false);
 user_pref("network.cookie.cookieBehavior", 5);
+user_pref("network.http.referer.XOriginTrimmingPolicy", 2);
 user_pref("network.protocol-handler.external.ms-windows-store", false);
 user_pref("privacy.donottrackheader.enabled", true);
 user_pref("privacy.globalprivacycontrol.enabled", true);