--- a/browser/components/preferences/in-content/extensionControlled.js
+++ b/browser/components/preferences/in-content/extensionControlled.js
@@ -55,17 +55,17 @@ let extensionControlledContentIds = {
           "trackingProtectionPBMExtensionContentLabel",
     };
   }
 };
 
 function getExtensionControlledArgs(settingName) {
   switch (settingName) {
     case "proxyConfig":
-      return [document.getElementById("bundleBrand").getString("brandShortName$
+      return [document.getElementById("bundleBrand").getString("brandShortName")];
     default:
       return [];
   }
 }
 
 
 let extensionControlledIds = {};