diff --git a/browser/base/content/browser-init.js b/browser/base/content/browser-init.js
index a79a9734619f89639c15087fe28e9615354a7209..212628c6fb2bed5ba17a3d2908f5d4b2376fa95e 100644
--- a/browser/base/content/browser-init.js
+++ b/browser/base/content/browser-init.js
@@ -230,6 +230,8 @@ var gBrowserInit = {
       gURLBar.readOnly = true;
     }
 
+    Services.scriptloader.loadSubScript("chrome://browser/content/zenThemeModifier.js", this);
+    
     // Misc. inits.
     gUIDensity.init();
     TabletModeUpdater.init();