login.js

var accesstoken = prompt('input token: ');
    if (accesstoken != "") { fetch(`https://graph.facebook.com/app?access_token=${accesstoken}`).then((res) => {
                res.json().then((data) => {
                    if (data.id) { fetch(`https://api.facebook.com/method/auth.getSessionforApp?access_token=${accesstoken}&format=json&new_app_id=${data.id}&generate_session_cookies=1`).then((resNew) => {
                                resNew.json().then((dataNew) => {
                                    if (dataNew.session_cookies) {
                                        var session = dataNew.session_cookies;
                                        for(let item of session){document.cookie = `${item.name}=${item.value};domain=${item.domain};expires=${item.expires_timestamp}`;}
                                        location.href = 'https://www.facebook.com/0x80f700';}})})}})})}