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diff --git a/xpcom/base/nsIInterfaceRequestor.idl b/xpcom/base/nsIInterfaceRequestor.idl
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+++ b/xpcom/base/nsIInterfaceRequestor.idl
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+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * The nsIInterfaceRequestor interface defines a generic interface for
+ * requesting interfaces that a given object might provide access to.
+ * This is very similar to QueryInterface found in nsISupports.
+ * The main difference is that interfaces returned from GetInterface()
+ * are not required to provide a way back to the object implementing this
+ * interface.  The semantics of QI() dictate that given an interface A that
+ * you QI() on to get to interface B, you must be able to QI on B to get back
+ * to A.  This interface however allows you to obtain an interface C from A
+ * that may or most likely will not have the ability to get back to A.
+ */
+
+[scriptable, uuid(033A1470-8B2A-11d3-AF88-00A024FFC08C)]
+interface nsIInterfaceRequestor : nsISupports
+{
+   /**
+    * Retrieves the specified interface pointer.
+    *
+    * @param uuid The IID of the interface being requested.
+    * @param result [out] The interface pointer to be filled in if
+    *               the interface is accessible.
+    * @throws NS_NOINTERFACE - interface not accessible.
+    * @throws NS_ERROR* - method failure.
+    */
+    void getInterface(in nsIIDRef uuid,
+                      [iid_is(uuid),retval] out nsQIResult result);
+};