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dbPromise.then(function(db) {
  var tx = db.transaction('store', 'readonly');
  var store = tx.objectStore('store');
  return store.openCursor();
}).then(function logItems(cursor) { //log to call from inside the function
  if (!cursor) {
    return;
  }
  console.log('Cursored at:', cursor.key);
  for (var field in cursor.value) {
    console.log(cursor.value[field]);
  }
  return cursor.continue().then(logItems);
}).then(function() {
  console.log('Done cursoring');
});