Login buttons for accessing various of customers account during test writing

accounts.js

// ==UserScript==
// @name         RF Accounts
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       Paul Sweeney Jr.
// @match        https://app.rainforestqa.com/login
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    loginButtonFor("Customer 1", "[email protected]", "asdf1234");
    loginButtonFor("Customer 2", "[email protected]", "asdf1234");
    loginButtonFor("Customer 3", "[email protected]", "asdf1234");

    function loginButtonFor(title, user, pass) {
      var centeredBox = document.querySelector("#sessions_controller_new > div.wrapper > div.login > div");
      var button = document.createElement("button");
      button.innerHTML = title;
      button.onclick = function() {
        login(user, pass);
      };
      centeredBox.insertBefore(button, centeredBox.firstChild);
    }

    function login(user, pass) {
      var emailField = document.querySelector("#email");
      var passwordField = document.querySelector("#password");
      var loginButton = document.querySelector("#sessions_controller_new > div.wrapper > div.login > div > form > button");
      emailField.value = user;
      passwordField.value = pass;
      loginButton.click();
    }
})();