diff --git a/mozilla/js/src/xpconnect/idl/Makefile.in b/mozilla/js/src/xpconnect/idl/Makefile.in
index a161efb760e..ef3d0776254 100644
--- a/mozilla/js/src/xpconnect/idl/Makefile.in
+++ b/mozilla/js/src/xpconnect/idl/Makefile.in
@@ -31,6 +31,7 @@ XPIDLSRCS	= \
 		xpctest2.idl \
 		xpcexception.idl \
 		nsIJSContextStack.idl \
+		nsIJSRuntimeService.idl \
 		nsIXPCSecurityManager.idl \
 		$(NULL)
 
diff --git a/mozilla/js/src/xpconnect/idl/makefile.win b/mozilla/js/src/xpconnect/idl/makefile.win
index f2565228e18..5e4325c523e 100644
--- a/mozilla/js/src/xpconnect/idl/makefile.win
+++ b/mozilla/js/src/xpconnect/idl/makefile.win
@@ -26,6 +26,7 @@ XPIDLSRCS = \
 	.\xpctest2.idl \
 	.\xpcexception.idl \
 	.\nsIJSContextStack.idl \
+	.\nsIJSRuntimeService.idl \
 	.\nsIXPCSecurityManager.idl \
 	$(NULL)
 
diff --git a/mozilla/js/src/xpconnect/idl/nsIJSRuntimeService.idl b/mozilla/js/src/xpconnect/idl/nsIJSRuntimeService.idl
new file mode 100644
index 00000000000..f7cafef989b
--- /dev/null
+++ b/mozilla/js/src/xpconnect/idl/nsIJSRuntimeService.idl
@@ -0,0 +1,27 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "MPL"); you may not use this file except in
+ * compliance with the MPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the MPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the MPL
+ * for the specific language governing rights and limitations under the
+ * MPL.
+ *
+ * The Initial Developer of this code under the MPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1999 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#include "nsISupports.idl"
+
+[ptr] native JSRuntime(JSRuntime);
+
+[uuid(dcfbb49c-1dd1-11b2-9f39-935aef484817)]
+interface nsIJSRuntimeService : nsISupports
+{
+    attribute JSRuntime        runtime;
+};