This userscript is meant to be a test for GM issue 1065.

gmTest-issue1065.user.js

// ==UserScript==
// @name         GM issue 1065 test
// @namespace    gmTest
// @include      *
// @match        *
// @datecreated  2010-03-10
// @lastupdated  2010-03-10
// @version      0.1
// @author       Erik Vergobbi Vold
// @license      GPL version 3 or any later version; http://www.gnu.org/copyleft/gpl.html
// @description  This userscript is meant to be a test for GM issue 1065
// ==/UserScript==

Object.prototype.AnyNameHere = function(x) {};
Object.prototype.foo = "foo\nbar";

GM_xmlhttpRequest({
    method: "GET",
    url: "http://www.google.com/",
    headers: {
        'User-agent': 'Mozilla/4.0 (compatible) Greasemonkey',
        'Accept': 'application/atom+xml,application/xml,text/xml',
    },
    onload: function(responseDetails) {
      alert('Request returned ' + responseDetails.status +
            ' ' + responseDetails.statusText + '\n\n' +
            'Data:\n' + responseDetails.responseText);
    }
});