title: Login to website with chrome extension and get data from it
body: <p>I am developing a Chrome/Chromium extension that will be reading school grades from the school system with grades. Problem is that site doesn't remember logged user. Because of this, I cannot use AJAX. </p>
  
  <p>Only if I'm logged to that page on other tabs. But I want to login to that page in the background and automatically. The solution may be maybe iframe tag, but Chrome/Chromium don't allow me to read and manipulate with iframe content. Is there any solution how to manipulate in the page as the logged user? Thank you</p>