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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsInterfaceHashtable.h b/src/libs/xpcom18a4/xpcom/ds/nsInterfaceHashtable.h
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+++ b/src/libs/xpcom18a4/xpcom/ds/nsInterfaceHashtable.h
@@ -0,0 +1,196 @@
+/* -*- 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 C++ hashtable templates.
+ *
+ * The Initial Developer of the Original Code is
+ * Benjamin Smedberg.
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either 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 nsInterfaceHashtable_h__
+#define nsInterfaceHashtable_h__
+
+#include "nsBaseHashtable.h"
+#include "nsHashKeys.h"
+#include "nsCOMPtr.h"
+
+/**
+ * templated hashtable class maps keys to interface pointers.
+ * See nsBaseHashtable for complete declaration.
+ * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
+ *   for a complete specification.
+ * @param Interface the interface-type being wrapped
+ * @see nsDataHashtable, nsClassHashtable
+ */
+template<class KeyClass,class Interface>
+class nsInterfaceHashtable :
+  public nsBaseHashtable< KeyClass, nsCOMPtr<Interface> , Interface* >
+{
+public:
+  typedef typename KeyClass::KeyType KeyType;
+  typedef Interface* UserDataType;
+
+  /**
+   * @copydoc nsBaseHashtable::Get
+   * @param pData This is an XPCOM getter, so pData is already_addrefed.
+   *   If the key doesn't exist, pData will be set to nsnull.
+   */
+  PRBool Get(KeyType aKey, UserDataType* pData) const;
+
+  /**
+   * Gets a weak reference to the hashtable entry.
+   * @param aFound If not nsnull, will be set to PR_TRUE if the entry is found,
+   *               to PR_FALSE otherwise.
+   * @return The entry, or nsnull if not found. Do not release this pointer!
+   */
+  Interface* GetWeak(KeyType aKey, PRBool* aFound = nsnull) const;
+};
+
+/**
+ * Thread-safe version of nsInterfaceHashtable
+ * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
+ *   for a complete specification.
+ * @param Interface the interface-type being wrapped
+ */
+template<class KeyClass,class Interface>
+class nsInterfaceHashtableMT :
+  public nsBaseHashtableMT< KeyClass, nsCOMPtr<Interface> , Interface* >
+{
+public:
+  typedef typename KeyClass::KeyType KeyType;
+  typedef Interface* UserDataType;
+
+  /**
+   * @copydoc nsBaseHashtable::Get
+   * @param pData This is an XPCOM getter, so pData is already_addrefed.
+   *   If the key doesn't exist, pData will be set to nsnull.
+   */
+  PRBool Get(KeyType aKey, UserDataType* pData) const;
+
+  // GetWeak does not make sense on a multi-threaded hashtable, where another
+  // thread may remove the entry (and hence release it) as soon as GetWeak
+  // returns
+};
+
+
+//
+// nsInterfaceHashtable definitions
+//
+
+template<class KeyClass,class Interface>
+PRBool
+nsInterfaceHashtable<KeyClass,Interface>::Get
+  (KeyType aKey, UserDataType* pInterface) const
+{
+  typename nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*>::EntryType* ent =
+    this->GetEntry(aKey);
+
+  if (ent)
+  {
+    if (pInterface)
+    {
+      *pInterface = ent->mData;
+
+      NS_IF_ADDREF(*pInterface);
+    }
+
+    return PR_TRUE;
+  }
+
+  // if the key doesn't exist, set *pInterface to null
+  // so that it is a valid XPCOM getter
+  if (pInterface)
+    *pInterface = nsnull;
+
+  return PR_FALSE;
+}
+
+template<class KeyClass,class Interface>
+Interface*
+nsInterfaceHashtable<KeyClass,Interface>::GetWeak
+  (KeyType aKey, PRBool* aFound) const
+{
+  typename nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*>::EntryType* ent =
+    this->GetEntry(aKey);
+
+  if (ent)
+  {
+    if (aFound)
+      *aFound = PR_TRUE;
+
+    return ent->mData;
+  }
+
+  // Key does not exist, return nsnull and set aFound to PR_FALSE
+  if (aFound)
+    *aFound = PR_FALSE;
+  return nsnull;
+}
+
+//
+// nsInterfaceHashtableMT definitions
+//
+
+template<class KeyClass,class Interface>
+PRBool
+nsInterfaceHashtableMT<KeyClass,Interface>::Get
+  (KeyType aKey, UserDataType* pInterface) const
+{
+  PR_Lock(this->mLock);
+
+  typename nsBaseHashtableMT<KeyClass, nsCOMPtr<Interface>, Interface*>::EntryType* ent =
+    this->GetEntry(aKey);
+
+  if (ent)
+  {
+    if (pInterface)
+    {
+      *pInterface = ent->mData;
+
+      NS_IF_ADDREF(*pInterface);
+    }
+
+    PR_Unlock(this->mLock);
+
+    return PR_TRUE;
+  }
+
+  // if the key doesn't exist, set *pInterface to null
+  // so that it is a valid XPCOM getter
+  if (pInterface)
+    *pInterface = nsnull;
+
+  PR_Unlock(this->mLock);
+
+  return PR_FALSE;
+}
+
+#endif // nsInterfaceHashtable_h__