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diff --git a/src/libs/xpcom18a4/xpcom/components/nsCategoryManager.h b/src/libs/xpcom18a4/xpcom/components/nsCategoryManager.h
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/components/nsCategoryManager.h
@@ -0,0 +1,159 @@
+/* -*- 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 NSCATEGORYMANAGER_H
+#define NSCATEGORYMANAGER_H
+
+#include "prio.h"
+#include "prlock.h"
+#include "plarena.h"
+#include "nsClassHashtable.h"
+#include "nsICategoryManager.h"
+
+#define NS_CATEGORYMANAGER_CLASSNAME     "Category Manager"
+
+/* 16d222a6-1dd2-11b2-b693-f38b02c021b2 */
+#define NS_CATEGORYMANAGER_CID \
+{ 0x16d222a6, 0x1dd2, 0x11b2, \
+  {0xb6, 0x93, 0xf3, 0x8b, 0x02, 0xc0, 0x21, 0xb2} }
+
+/**
+ * a "leaf-node", managed by the nsCategoryNode hashtable.
+ *
+ * we need to keep a "persistent value" (which will be written to the registry)
+ * and a non-persistent value (for the current runtime): these are usually
+ * the same, except when aPersist==PR_FALSE. The strings are permanently arena-
+ * allocated, and will never go away.
+ */
+class CategoryLeaf : public nsDepCharHashKey
+{
+public:
+  CategoryLeaf(const char* aKey)
+    : nsDepCharHashKey(aKey),
+      pValue(nsnull),
+      nonpValue(nsnull) { }
+  const char* pValue;
+  const char* nonpValue;
+};
+
+
+/**
+ * CategoryNode keeps a hashtable of it's entries.
+ * the CategoryNode itself is permanently allocated in
+ * the arena.
+ */
+class CategoryNode
+{
+public:
+  NS_METHOD GetLeaf(const char* aEntryName,
+                    char** _retval);
+
+  NS_METHOD AddLeaf(const char* aEntryName,
+                    const char* aValue,
+                    PRBool aPersist,
+                    PRBool aReplace,
+                    char** _retval,
+                    PLArenaPool* aArena);
+
+  NS_METHOD DeleteLeaf(const char* aEntryName,
+                       PRBool aDontPersist);
+
+  void Clear() {
+    PR_Lock(mLock);
+    mTable.Clear();
+    PR_Unlock(mLock);
+  }
+
+  PRUint32 Count() {
+    PR_Lock(mLock);
+    PRUint32 tCount = mTable.Count();
+    PR_Unlock(mLock);
+    return tCount;
+  }
+
+  NS_METHOD Enumerate(nsISimpleEnumerator** _retval);
+
+  PRBool WritePersistentEntries(PRFileDesc* fd, const char* aCategoryName);
+
+  // CategoryNode is arena-allocated, with the strings
+  static CategoryNode* Create(PLArenaPool* aArena);
+  ~CategoryNode();
+  void operator delete(void*) { }
+
+private:
+  CategoryNode() : mLock(nsnull) { }
+  void* operator new(size_t aSize, PLArenaPool* aArena);
+
+  nsTHashtable<CategoryLeaf> mTable;
+  PRLock* mLock;
+};
+
+
+/**
+ * The main implementation of nsICategoryManager.
+ *
+ * This implementation is thread-safe.
+ */
+class nsCategoryManager
+  : public nsICategoryManager
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSICATEGORYMANAGER
+
+  /**
+   * Write the categories to the XPCOM persistent registry.
+   * This is to be used by nsComponentManagerImpl (and NO ONE ELSE).
+   */
+  NS_METHOD WriteCategoryManagerToRegistry(PRFileDesc* fd);
+
+  nsCategoryManager() : mLock(nsnull) { }
+private:
+  friend class nsCategoryManagerFactory;
+  static nsCategoryManager* Create();
+
+  ~nsCategoryManager();
+
+  CategoryNode* get_category(const char* aName);
+
+  PLArenaPool mArena;
+  nsClassHashtable<nsDepCharHashKey, CategoryNode> mTable;
+  PRLock* mLock;
+};
+
+#endif