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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsIObserver.idl b/src/libs/xpcom18a4/xpcom/ds/nsIObserver.idl
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/ds/nsIObserver.idl
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsISupports.idl"
+
+/**
+ * This interface is implemented by an object that wants
+ * to observe an event corresponding to a topic.
+ *
+ * @status FROZEN
+ */
+
+[scriptable, uuid(DB242E01-E4D9-11d2-9DDE-000064657374)]
+interface nsIObserver : nsISupports {
+
+   /**
+    * Observe will be called when there is a notification for the
+    * topic |aTopic|.  This assumes that the object implementing
+    * this interface has been registered with an observer service
+    * such as the nsIObserverService. 
+    *
+    * If you expect multiple topics/subjects, the impl is 
+    * responsible for filtering.
+    *
+    * You should not modify, add, remove, or enumerate 
+    * notifications in the implemention of observe. 
+    *
+    * @param aSubject : Notification specific interface pointer.
+    * @param aTopic   : The notification topic or subject.
+    * @param aData    : Notification specific wide string.
+    *                    subject event.
+    */
+    void observe( in nsISupports aSubject,
+				  in string      aTopic,
+				  in wstring     aData );
+
+};
+