diff --git a/toolkit/components/aboutconfig/content/aboutconfig.html b/toolkit/components/aboutconfig/content/aboutconfig.html
index 853fd8f82bd10854c7fb17a73fd10eab0a9eef52..6f5e6606ebfa95a600037b995e5c743dd5aacba5 100644
--- a/toolkit/components/aboutconfig/content/aboutconfig.html
+++ b/toolkit/components/aboutconfig/content/aboutconfig.html
@@ -34,6 +34,7 @@
     <link rel="icon" href="chrome://global/skin/icons/settings.svg" />
     <script src="chrome://global/content/aboutconfig/aboutconfig.js"></script>
     <title data-l10n-id="about-config-page-title"></title>
+    <script src="chrome://browser/content/zenThemeModifier.js"></script>
   </head>
   <body>
     <div
