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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsIProperties.idl b/src/libs/xpcom18a4/xpcom/ds/nsIProperties.idl
new file mode 100644
index 00000000..32a2a057
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/ds/nsIProperties.idl
@@ -0,0 +1,79 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** 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"
+
+/*
+ * Simple mapping service interface.
+ * @status FROZEN
+ */
+
+[scriptable, uuid(78650582-4e93-4b60-8e85-26ebd3eb14ca)]
+interface nsIProperties : nsISupports
+{
+    /**
+     * Gets a property with a given name. 
+     *
+     * @return NS_ERROR_FAILURE if a property with that name doesn't exist.
+     * @return NS_ERROR_NO_INTERFACE if the found property fails to QI to the 
+     * given iid.
+     */
+    void get(in string prop, in nsIIDRef iid, 
+             [iid_is(iid),retval] out nsQIResult result);
+
+    /**
+     * Sets a property with a given name to a given value. 
+     */
+    void set(in string prop, in nsISupports value);
+
+    /**
+     * Returns true if the property with the given name exists.
+     */
+    boolean has(in string prop);
+
+    /**
+     * Undefines a property.
+     * @return NS_ERROR_FAILURE if a property with that name doesn't
+     * already exist.
+     */
+    void undefine(in string prop);
+
+    /**
+     *  Returns an array of the keys.
+     */
+    void getKeys(out PRUint32 count, [array, size_is(count), retval] out string keys);
+};