PintsizedSix40 / freesteamkeys.com ad remover

// ==UserScript==
// @name     freesteamkeys.com ad remover
// @version  1
// @grant    none
// @license  MIT
// @copyright  2018, PintsizedSix40 (https://openuserjs.org/users/PintsizedSix40)
// ==/UserScript==

function removeElementsByClass(className) {
  var elements = document.getElementsByClassName(className);
  while (elements.length > 0) {
    elements[0].parentNode.removeChild(elements[0]);
  }
}
removeElementsByClass('advertisement');