diff --git a/netwerk/base/public/nsIProxyAutoConfig.idl b/netwerk/base/public/nsIProxyAutoConfig.idl
index 140732a47e7..ed4f6bd761d 100644
--- a/netwerk/base/public/nsIProxyAutoConfig.idl
+++ b/netwerk/base/public/nsIProxyAutoConfig.idl
@@ -42,3 +42,17 @@ interface nsIProxyAutoConfig : nsISupports
     */
     void ProxyForURL(in nsIURI uri, out string host, out long port);
 };
+
+%{C++
+#define NS_PROXY_AUTO_CONFIG_CID                  \
+{ /* 63ac8c66-1dd2-11b2-b070-84d00d3eaece */         \
+    0x63ac8c66,                                      \
+    0x1dd2,                                          \
+    0x11b2,                                          \
+    {0xb0, 0x70, 0x84, 0xd0, 0x0d, 0x3e, 0xae, 0xce} \
+}
+
+#define NS_PROXY_AUTO_CONFIG_PROGID \
+    "component://mozilla/network/proxy_autoconfig" 
+
+%}
diff --git a/netwerk/base/public/nsIWebFilters.idl b/netwerk/base/public/nsIWebFilters.idl
new file mode 100644
index 00000000000..021c8fe10a0
--- /dev/null
+++ b/netwerk/base/public/nsIWebFilters.idl
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape 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/NPL/
+ *
+ * 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 Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): 
+ */
+
+/**
+* The nsIWebFilters is a simple interface for determining if the specified
+* uri is allowed to load or not. 
+*   - Gagan Saksena 05/04/00 
+*/
+#include "nsISupports.idl"
+
+interface nsIURI;
+
+[scriptable, uuid(ee9d42f2-1dd1-11b2-b909-b34b63e205e8)]
+interface nsIWebFilters : nsISupports
+{
+    /**
+    * allowLoading the specified uri.
+    */
+    boolean allowLoading(in nsIURI uri);
+};
+
+%{C++
+#define NS_WEBFILTERS_CID                  \
+{ /* 4677ea1e-1dd2-11b2-8654-e836efb6995c */         \
+    0x4677ea1e,                                      \
+    0x1dd2,                                          \
+    0x11b2,                                          \
+    {0x86, 0x54, 0xe8, 0x36, 0xef, 0xb6, 0x99, 0x5c} \
+}
+
+#define NS_WEBFILTERS_PROGID "component://mozilla/network/filters" 
+
+%}