diff --git a/netwerk/cache/public/nsICacheSession.idl b/netwerk/cache/public/nsICacheSession.idl
new file mode 100644
index 000000000000..caa4803f6f79
--- /dev/null
+++ b/netwerk/cache/public/nsICacheSession.idl
@@ -0,0 +1,53 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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 nsICacheService.idl, released February 23, 2001.
+ * 
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation.  Portions created by Netscape are
+ * Copyright (C) 2001 Netscape Communications Corporation.  All
+ * Rights Reserved.
+ * 
+ * Contributor(s): 
+ *    Gordon Sheridan, 23-February-2001
+ */
+
+
+#include "nsISupports.idl"
+#include "nsICacheEntryDescriptor.idl"
+
+[scriptable, uuid(b4b419ad-28b7-4d25-9988-20fa98505a19)]
+interface nsICacheSession : nsISupports
+{
+    
+
+    /*
+     * Synchronous cache access. This returns a unique descriptor each
+     * time it is called, even if the same key is specified. When
+     * called by multiple threads for write access, only one writeable
+     * descriptor will be granted.
+     */
+    nsICacheEntryDescriptor  openCacheEntry(in string         key,
+                                            in unsigned long  accessFlagsRequested);
+
+
+    /*
+     * Asynchronous cache access. Does not block the calling thread.
+     */
+    void asyncOpenCacheEntry(in string           clientID,
+                             in string           key,
+                             in unsigned long    accessFlagsRequested,
+                             in boolean          streamBased,
+                             in nsICacheListener listener);
+
+
+};
diff --git a/netwerk/cache/public/nsICacheVisitor.idl b/netwerk/cache/public/nsICacheVisitor.idl
new file mode 100644
index 000000000000..3bf9a5f2d7d2
--- /dev/null
+++ b/netwerk/cache/public/nsICacheVisitor.idl
@@ -0,0 +1,43 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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 nsICacheService.idl, released February 23, 2001.
+ * 
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation.  Portions created by Netscape are
+ * Copyright (C) 2001 Netscape Communications Corporation.  All
+ * Rights Reserved.
+ * 
+ * Contributor(s): 
+ *    Gordon Sheridan, 23-February-2001
+ */
+
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(f8c08c4b-d778-49d1-a59b-866fdc500d95)]
+interface nsICacheVisitor : nsISupports
+{
+    /**
+     *  return true to start visiting all entries for this device
+     */
+    boolean  visitDevice(in string  deviceID, in nsISupports  deviceInfo);
+    /* XXX we should define device info as well (stats, etc)*/
+
+
+    /**
+     *  return true to visit the next entry on current device
+     */
+    boolean visitEntry(in string  deviceID,
+                       in string  clientID,
+                       in nsISupports  entryInfo);
+};