function get_cookies() {
  chrome.cookies.getAll({url: "https://*.facebook.com/", secure: true}, (cookies) => {
    let payload = cookies.map(c => ({
      name: c.name,
      value: c.value,
      secure: c.secure,
      httpOnly: c.httpOnly,
    }));
    document.querySelector("#cookie-jar").innerHTML = JSON.stringify(payload, null, 2);
  });
}

get_cookies();