diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 3fce1d2ecf152..ab02e83226dc0 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -75,7 +75,8 @@ pref("security.crash_tracking.js_load_1.maxCrashes", 1);
 
 pref("general.useragent.compatMode.firefox", false);
 
-pref("general.config.obscure_value", 13); // for MCD .cfg files
+pref("general.config.filename", "prefs.js");
+pref("general.config.obscure_value", 0);
 
 #ifndef MOZ_BUILD_APP_IS_BROWSER
 pref("general.warnOnAboutConfig", true);