问题
If http://example.com/ creates an IndexedDB database, is it possible for a Chrome extension (used on domains other than example.com) to open and query this database?
回答1:
No, you can not do it. The data storage is sandboxed http://www.html5rocks.com/en/tutorials/offline/storage/
来源：https://stackoverflow.com/questions/13453418/is-it-possible-for-a-chrome-extension-to-access-an-indexeddb-database-created-by