const dislike = (el) => {
  return new Promise((res, rej) => {
    el.click();
    setTimeout(() => {
      document.querySelector('a.itemAnchor').click();
      setTimeout(() => {
        res();
      }, 1000);
    }, 2000);
  });
}

async function run (coll) {
  for (let el of coll) {
    await dislike(el);
  };
}

const coll = document.getElementsByClassName('PageLikeButton');
run(coll);