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diff --git a/netwerk/mime/nsIMIMEService.idl b/netwerk/mime/nsIMIMEService.idl
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+++ b/netwerk/mime/nsIMIMEService.idl
@@ -0,0 +1,75 @@
+/* -*- Mode: IDL; 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 "nsISupports.idl"
+
+interface nsIFile;
+interface nsIMIMEInfo;
+interface nsIURI;
+
+%{C++
+#define NS_MIMESERVICE_CID                           \
+{ /* 03af31da-3109-11d3-8cd0-0060b0fc14a3 */         \
+    0x03af31da,                                      \
+    0x3109,                                          \
+    0x11d3,                                          \
+    {0x8c, 0xd0, 0x00, 0x60, 0xb0, 0xfc, 0x14, 0xa3} \
+}
+%}
+
+/**
+ * The MIME service is responsible for mapping file extensions to MIME-types
+ * (see RFC 2045). It also provides access to nsIMIMEInfo interfaces and
+ * acts as a general convenience wrapper of nsIMIMEInfo interfaces.
+ *
+ * The MIME service maintains a database with a <b>one</b> MIME type <b>to many</b>
+ * file extensions rule. Adding the same file extension to multiple MIME types
+ * is illegal and behavior is undefined.
+ *
+ * @see nsIMIMEInfo
+ */
+[scriptable, main_process_scriptable_only, uuid(5b3675a1-02db-4f8f-a560-b34736635f47)]
+interface nsIMIMEService : nsISupports {
+    /**
+     * Retrieves an nsIMIMEInfo using both the extension
+     * and the type of a file. The type is given preference
+     * during the lookup. One of aMIMEType and aFileExt
+     * can be an empty string. At least one of aMIMEType and aFileExt
+     * must be nonempty.
+     */
+    nsIMIMEInfo getFromTypeAndExtension(in ACString aMIMEType, in AUTF8String aFileExt);
+
+    /**
+     * Retrieves a ACString representation of the MIME type
+     * associated with this file extension.
+     *
+     * @param  A file extension (excluding the dot ('.')).
+     * @return The MIME type, if any.
+     */
+    ACString getTypeFromExtension(in AUTF8String aFileExt);
+
+    /**
+     * Retrieves a ACString representation of the MIME type
+     * associated with this URI. The association is purely
+     * file extension to MIME type based. No attempt to determine
+     * the type via server headers or byte scanning is made.
+     *
+     * @param  The URI the user wants MIME info on.
+     * @return The MIME type, if any.
+     */
+    ACString getTypeFromURI(in nsIURI aURI);
+    
+    //
+    ACString getTypeFromFile(in nsIFile aFile);
+
+    /**
+     * Given a Type/Extension combination, returns the default extension
+     * for this type. This may be identical to the passed-in extension.
+     *
+     * @param aMIMEType The Type to get information on. Must not be empty.
+     * @param aFileExt  File Extension. Can be empty.
+     */
+    AUTF8String getPrimaryExtension(in ACString aMIMEType, in AUTF8String aFileExt);
+};