diff -r 000000000000 -r 6474c204b198 xpcom/system/nsIGnomeVFSService.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/system/nsIGnomeVFSService.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 2; 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"
+
+interface nsIUTF8StringEnumerator;
+interface nsIURI;
+
+/* nsIGnomeVFSMimeApp holds information about an application that is looked up
+   with nsIGnomeVFSService::GetAppForMimeType. */
+
+[scriptable, uuid(66009894-9877-405b-9321-bf30420e34e6)]
+interface nsIGnomeVFSMimeApp : nsISupports
+{
+  const long EXPECTS_URIS  = 0;
+  const long EXPECTS_PATHS = 1;
+  const long EXPECTS_URIS_FOR_NON_FILES = 2;
+
+  readonly attribute AUTF8String         id;
+  readonly attribute AUTF8String         name;
+  readonly attribute AUTF8String         command;
+  readonly attribute boolean             canOpenMultipleFiles;
+  readonly attribute long                expectsURIs;  // see constants above
+  readonly attribute nsIUTF8StringEnumerator supportedURISchemes;
+  readonly attribute boolean             requiresTerminal;
+
+  void launch(in AUTF8String uri);
+};
+
+/*
+ * The VFS service makes use of a registry for information.
+ *
+ * The MIME registry holds information about MIME types, such as which
+ * extensions map to a given MIME type.  The MIME registry also stores the
+ * id of the application selected to handle each MIME type.
+ */
+
+[scriptable, uuid(d1ac73a6-2ceb-4164-8142-215afe7fe8a6)]
+interface nsIGnomeVFSService : nsISupports
+{
+  /*** MIME registry methods ***/
+
+  /* Obtain the MIME type registered for an extension.  The extension
+     should not include a leading dot. */
+  AUTF8String        getMimeTypeFromExtension(in AUTF8String extension);
+
+  /* Obtain the preferred application for opening a given MIME type */
+  nsIGnomeVFSMimeApp getAppForMimeType(in AUTF8String mimeType);
+
+  /* Obtain a description for the given MIME type */
+  AUTF8String        getDescriptionForMimeType(in AUTF8String mimeType);
+
+  /*** Misc. methods ***/
+
+  /* Open the given URI in the default application */
+  void               showURI(in nsIURI uri);
+  [noscript] void    showURIForInput(in ACString uri);
+};
+
+%{C++
+#define NS_GNOMEVFSSERVICE_CONTRACTID "@mozilla.org/gnome-vfs-service;1"
+%}