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diff --git a/comm/mailnews/mime/cthandlers/glue/nsMimeContentTypeHandler.h b/comm/mailnews/mime/cthandlers/glue/nsMimeContentTypeHandler.h
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+++ b/comm/mailnews/mime/cthandlers/glue/nsMimeContentTypeHandler.h
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+/* -*- Mode: C; 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/. */
+
+/*
+ * This interface is implemented by content type handlers that will be
+ * called upon by libmime to process various attachments types. The primary
+ * purpose of these handlers will be to represent the attached data in a
+ * viewable HTML format that is useful for the user
+ *
+ * Note: These will all register by their content type prefixed by the
+ *       following:  mimecth:text/vcard
+ *
+ *       libmime will then use the XPCOM Component Manager to
+ *       locate the appropriate Content Type handler
+ */
+#ifndef nsMimeContentTypeHandler_h_
+#define nsMimeContentTypeHandler_h_
+
+#include "mozilla/Attributes.h"
+#include "nsIMimeContentTypeHandler.h"
+
+typedef MimeObjectClass* (*MCTHCreateCTHClass)(
+    const char* content_type, contentTypeHandlerInitStruct* initStruct);
+
+class nsMimeContentTypeHandler : public nsIMimeContentTypeHandler {
+ public:
+  nsMimeContentTypeHandler(const char* aMimeType, MCTHCreateCTHClass callback);
+
+  /* this macro defines QueryInterface, AddRef and Release for this class */
+  NS_DECL_ISUPPORTS
+
+  NS_IMETHOD GetContentType(char** contentType) override;
+
+  NS_IMETHOD CreateContentTypeHandlerClass(
+      const char* content_type, contentTypeHandlerInitStruct* initStruct,
+      MimeObjectClass** objClass) override;
+
+ private:
+  virtual ~nsMimeContentTypeHandler();
+  char* mimeType;
+  MCTHCreateCTHClass realCreateContentTypeHandlerClass;
+};
+
+#endif /* nsMimeContentTypeHandler_h_ */