--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_cache.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_cache.js
@@ -98,19 +98,17 @@ function getStorageEntryCount(device, go
       goon(this.entryCount);
     }
   };
 
   storage.asyncVisitStorage(visitor, true);
 }
 
 function get_cache_for_private_window () {
-  let win = OpenBrowserWindow({private: true});
-  win.addEventListener("load", function () {
-    win.removeEventListener("load", arguments.callee, false);
+  let win = whenNewWindowLoaded({private: true}, function() {
 
     executeSoon(function() {
 
       ok(true, "The private window got loaded");
 
       let tab = win.gBrowser.addTab("http://example.org");
       win.gBrowser.selectedTab = tab;
       let newTabBrowser = win.gBrowser.getBrowserForTab(tab);
@@ -130,10 +128,10 @@ function get_cache_for_private_window ()
 
               win.close();
               finish();
             });
           });
         });
       }, true);
     });
-  }, false);
+  });
 }