diff -r 8c5b036c35d3 js/src/xpconnect/src/nsScriptError.cpp
--- a/js/src/xpconnect/src/nsScriptError.cpp	Sat Dec 06 21:11:23 2008 -0800
+++ b/js/src/xpconnect/src/nsScriptError.cpp	Tue Dec 23 17:44:02 2008 +0800
@@ -42,6 +42,7 @@
  * place to put XPCOM things.
  */
 
+#include "nsString.h"
 #include "xpcprivate.h"
 
 NS_IMPL_THREADSAFE_ISUPPORTS2(nsScriptError, nsIConsoleMessage, nsIScriptError)
@@ -136,6 +137,17 @@ nsScriptError::Init(const PRUnichar *mes
     mFlags = flags;
     mCategory.Assign(category);
 
+    // added by agentzh
+    if (flags == 0) { // errors only
+        fprintf(
+            stderr,
+            "[error] ErrorConsole: %s: line %d: %s\n",
+            NS_ConvertUTF16toUTF8(sourceName).get(),
+            lineNumber,
+            NS_ConvertUTF16toUTF8(message).get()
+        );
+    }
+
     return NS_OK;
 }