Parse profile id, vanity, and name from Facebook friends page. Make sure you scroll to bottom first!

parseFacebookFriendPage.js

function parse() {
  let people = document.querySelectorAll("._5qo4");
  for (let i = 0; i < people.length; i++) {
    const aElement = people[i].querySelector("a._5q6s");
    let id = null;
    let vanity = null;
    if (aElement != null) {
      const hovercardLink = aElement.getAttribute("data-hovercard");
      const idRegex = new RegExp("^/ajax/hovercard/user.php\\?id=(\\d{1,})&.{1,}", "g");
      id = idRegex.exec(hovercardLink)[1];
      const profileLink = aElement.href;
      const vanityRegex = new RegExp("^https://www.facebook.com/(.{1,}?)\\?.{1,}", "g");
      vanity = vanityRegex.exec(profileLink)[1];
    }
    const imgElement = people[i].querySelector("img");
    const name = imgElement.getAttribute("aria-label");
    console.log(`${id},${vanity},${name}`);
  }
}