Working example of GM_xmlhttpRequest speaking XML

gde33_example.user.js

// ==UserScript==
// @name           gde33 XML example
// @namespace      https://github.com/broquaint
// @description    Working example of GM_xmlhttpRequest speaking XML
// @include        http://en.wikipedia.org/wiki/Main_Page
// ==/UserScript==

// For some reason console.log wasn't working, too lazy to investigate why.
unsafeWindow.console.log("Requesting stuff!");
GM_xmlhttpRequest({
  method: 'GET',
  url:    'http://en.wikipedia.org/w/api.php?action=query&prop=revisions&revids=375536&rvdiffto=prev&format=xml',
  onload: function(response) {
    var xml = new DOMParser()
            .parseFromString(response.responseText, "text/xml");
    unsafeWindow.console.log("The response was: ", xml);
  }
});