diff --git a/browser/components/preferences/preferences.js b/browser/components/preferences/preferences.js
index 7e21bab426b6eb52fe84876d817fddbdb1a35ffc..fb7c6f419c02701aecd148ef2fe271ed6f1a73c1 100644
--- a/browser/components/preferences/preferences.js
+++ b/browser/components/preferences/preferences.js
@@ -196,6 +196,9 @@ function init_all() {
   // the entire document.
   Preferences.queueUpdateOfAllElements();
   Services.telemetry.setEventRecordingEnabled("aboutpreferences", true);
+  register_module("paneZenLooks", gZenLooksAndFeel);
+  register_module("paneZenWorkspaces", gZenWorkspacesSettings);
+  register_module("paneZenCKS", gZenCKSSettings);
 
   register_module("paneGeneral", gMainPane);
   register_module("paneHome", gHomePane);