--- a/accessible/tests/mochitest/events/test_docload.xul
+++ b/accessible/tests/mochitest/events/test_docload.xul
@@ -105,17 +105,18 @@
 
       this.unexpectedEventSeq = [
         new invokerChecker(EVENT_DOCUMENT_LOAD_COMPLETE, getNestedDoc),
         new invokerChecker(EVENT_STATE_CHANGE, getNestedDoc)
       ];
 
       function getNestedDoc()
       {
-        return currentTabDocument().getElementsByTagName("iframe")[0].firstChild;
+        var iframeNodes = currentTabDocument().getElementsByTagName("iframe");
+        return iframeNodes ? iframeNodes[0].firstChild : null;
       }
     }
 
     /**
      * Reload the page by F5 (isFromUserInput flag is true).
      */
     function userReloadInvoker()
     {
@@ -182,17 +183,17 @@
       {
         return "load error page: '" + aURLDescr + "'";
       }
     }
 
     ////////////////////////////////////////////////////////////////////////////
     // Tests
 
-    gA11yEventDumpToConsole = true; // debug
+    //gA11yEventDumpToConsole = true; // debug
     //gA11yEventDumpFeature = "parentchain:reorder";
 
     var gQueue = null;
     function doTests()
     {
       gQueue = new eventQueue();
 
       var dataURL =