Don't add the rdfAppcore explicitly, since that call fails internally in Appcoresmanager

and control is never returned to Javascript to execute the loadURL call.
rdfCore.Init() already does the job of XPAppcoresManager.add()

xpfe/browser/src/navigator.xul

@@ -252,7 +252,7 @@
 		if (rdfCore)
 		{
 			rdfCore.Init("RDFCore");
-			XPAppCoresManager.Add(rdfCore);
+			//XPAppCoresManager.Add(rdfCore);
 			rdfCoreFound = true;
 		}
 	}