The Tor Browser / file revision

 /* 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/. */

 function handleRequest(request, response) {

   response.setStatusLine(request.httpVersion, 200, "OK");

   if (!request.queryString.match(/^name=/))

     return;

   var name = decodeURIComponent(request.queryString.substring(5));

   response.setHeader("Content-Type", "application/octet-stream; name=\"" + name + "\"");

   response.setHeader("Content-Disposition", "inline; filename=\"" + name + "\"");

 }