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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsPersistentProperties.h b/src/libs/xpcom18a4/xpcom/ds/nsPersistentProperties.h
new file mode 100644
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--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/ds/nsPersistentProperties.h
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; 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 ***** */
+
+#ifndef nsPersistentProperties_h___
+#define nsPersistentProperties_h___
+
+#include "nsIPersistentProperties2.h"
+#include "pldhash.h"
+#include "plarena.h"
+#include "nsString.h"
+
+class nsIUnicharInputStream;
+
+
+class nsPersistentProperties : public nsIPersistentProperties
+{
+public:
+  nsPersistentProperties();
+  nsresult Init();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIPROPERTIES
+  NS_DECL_NSIPERSISTENTPROPERTIES
+
+
+  // nsPersistentProperties methods:
+  PRInt32 Read();
+  PRInt32 SkipLine(PRInt32 c);
+  PRInt32 SkipWhiteSpace(PRInt32 c);
+
+  static NS_METHOD
+  Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+private:
+  ~nsPersistentProperties();
+
+protected:
+  nsIUnicharInputStream* mIn;
+  PRUint32 mBufferPos;
+  PRUint32 mBufferLength;
+  nsIPersistentProperties* mSubclass;
+  struct PLDHashTable mTable;
+  PLArenaPool mArena;
+};
+
+class nsPropertyElement : public nsIPropertyElement 
+{
+public:
+  nsPropertyElement()
+  {
+  }
+
+  nsPropertyElement(const nsACString& aKey, const nsAString& aValue)
+    : mKey(aKey), mValue(aValue)
+  {
+  }
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIPROPERTYELEMENT
+
+  static NS_METHOD
+  Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+private:
+  ~nsPropertyElement() {}
+
+protected:
+  nsCString mKey;
+  nsString mValue;
+};
+
+#endif /* nsPersistentProperties_h___ */