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diff --git a/mailnews/mime/public/nsIMimeHeaders.idl b/mailnews/mime/public/nsIMimeHeaders.idl
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+++ b/mailnews/mime/public/nsIMimeHeaders.idl
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "msgIStructuredHeaders.idl"
+
+%{C++
+#define NS_IMIMEHEADERS_CONTRACTID \
+  "@mozilla.org/messenger/mimeheaders;1"
+%}
+
+/**
+ * An interface that can extract individual headers from a body of headers.
+ */
+[scriptable, uuid(a9222679-b991-4786-8314-f8819c3a2ba3)]
+interface nsIMimeHeaders : msgIStructuredHeaders {
+  /// Feed in the text of headers
+  void initialize(in ACString allHeaders);
+
+  /**
+   * Get the text of a header.
+   *
+   * Leading and trailing whitespace from headers will be stripped from the
+   * return value. If getAllOfThem is set to true, then the returned string will
+   * have all of the values of the header, in order, joined with the ',\r\n\t'.
+   *
+   * If the header is not present, then the returned value is NULL.
+   */
+  ACString extractHeader(in string headerName, in boolean getAllOfThem);
+
+  /**
+   * The current text of all header data.
+   *
+   * Unlike the asMimeText property, this result preserves the original
+   * representation of the header text, including alternative line endings or
+   * custom, non-8-bit text. For instances of this interface, this attribute is
+   * usually preferable to asMimeText.
+   */
+  readonly attribute ACString allHeaders;
+};