Access your Firebase Auth Token by dumping your IndexedDB session

Firebase Local Storage IndexedDb Dump.js

function getToken() {
  return new Promise((resolve, reject) => {
    let db;
    let request = indexedDB.open("firebaseLocalStorageDb");

    request.onerror = function (event) {
      console.error(event);
      reject(event);
    };

    request.onsuccess = function (event) {
      db = event.target.result;
      db.transaction("firebaseLocalStorage")
        .objectStore("firebaseLocalStorage")
        .openCursor()
        .onsuccess = function (event) {
          let data = event.target.result;
          resolve([data.value.value.stsTokenManager.accessToken, data]);
          db.close();
        };
    };
  });
}

getToken().then(result => console.log(result[0]));