diff --git a/suite/browser/navigator.js b/suite/browser/navigator.js
index 0cb344428dee..087cbfbfc03c 100644
--- a/suite/browser/navigator.js
+++ b/suite/browser/navigator.js
@@ -1608,6 +1608,7 @@ function checkForDirectoryListing() {
          !window._content.HTTPIndex.constructor ) {
         // Give directory .xul/.js access to browser instance.
         window._content.defaultCharacterset = appCore.GetDocumentCharset();
+        window._content.parentWindow = window;
     }
 }