// ==UserScript==
// @name        findface hack
// @include     http://findface.ru/*
// @version     1
// @grant       none
// ==/UserScript==

(function(open) {

    XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {

        this.addEventListener("readystatechange", function() {
            if (this.readyState == 4 && url.startsWith("http://webapi.findface.ru/v2/search/list3")) {
              document.body.innerHTML = "";
              JSON.parse(this.responseText).forEach(function(e) {
                  document.body.innerHTML += "<a target='_blank' href='https://vk.com/id" + e.user_id.toString() + "'</a>id" + e.user_id.toString() + "<br>";
              })
            }
        }, false);

        open.call(this, method, url, async, user, pass);
    };

})(XMLHttpRequest.prototype.open);