diff --git a/toolkit/components/aboutprocesses/content/aboutProcesses.html b/toolkit/components/aboutprocesses/content/aboutProcesses.html
index 1d936bcca6a606f062b9438d78a1165445468471..cbefb51920e7b2ad11621ab2b36c69fa63967dfe 100644
--- a/toolkit/components/aboutprocesses/content/aboutProcesses.html
+++ b/toolkit/components/aboutprocesses/content/aboutProcesses.html
@@ -20,6 +20,7 @@
     <link rel="localization" href="branding/brand.ftl" />
     <script src="chrome://global/content/aboutProcesses.js"></script>
     <link rel="stylesheet" href="chrome://global/content/aboutProcesses.css" />
+    <script src="chrome://browser/content/zenThemeModifier.js"></script>
   </head>
   <body>
     <table id="process-table">
