diff --git a/mozilla/layout/base/public/nsIFrameUtil.h b/mozilla/layout/base/public/nsIFrameUtil.h
new file mode 100644
index 00000000000..6387450fb40
--- /dev/null
+++ b/mozilla/layout/base/public/nsIFrameUtil.h
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (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 Communicator client 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.
+ */
+#ifndef nsIFrameUtil_h___
+#define nsIFrameUtil_h___
+
+#include "nsIXMLContent.h"
+class nsIURL;
+
+/* a6cf90d4-15b3-11d2-932e-00805f8add32 */
+#define NS_IFRAME_UTIL_IID \
+ { 0xa6cf90d4, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
+
+/**
+ * Frame utility interface
+ */
+class nsIFrameUtil : public nsISupports {
+public:
+  /**
+   * Load frame regression data from the given URL synchronously.
+   * Once the data is loaded and translated into a content tree,
+   * return in aResult a pointer to the root of the tree.
+   */
+  NS_IMETHOD LoadFrameRegressionData(nsIURL* aURL,
+                                     nsIXMLContent** aResult) = 0;
+};
+
+#endif /* nsIFrameUtil_h___ */
diff --git a/mozilla/layout/generic/nsIFrameUtil.h b/mozilla/layout/generic/nsIFrameUtil.h
new file mode 100644
index 00000000000..6387450fb40
--- /dev/null
+++ b/mozilla/layout/generic/nsIFrameUtil.h
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (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 Communicator client 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.
+ */
+#ifndef nsIFrameUtil_h___
+#define nsIFrameUtil_h___
+
+#include "nsIXMLContent.h"
+class nsIURL;
+
+/* a6cf90d4-15b3-11d2-932e-00805f8add32 */
+#define NS_IFRAME_UTIL_IID \
+ { 0xa6cf90d4, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}
+
+/**
+ * Frame utility interface
+ */
+class nsIFrameUtil : public nsISupports {
+public:
+  /**
+   * Load frame regression data from the given URL synchronously.
+   * Once the data is loaded and translated into a content tree,
+   * return in aResult a pointer to the root of the tree.
+   */
+  NS_IMETHOD LoadFrameRegressionData(nsIURL* aURL,
+                                     nsIXMLContent** aResult) = 0;
+};
+
+#endif /* nsIFrameUtil_h___ */