title: Can I get access to localStorage of site from chrome extension?
body: <p>My chrome extension has two state: 
   1. Some site has auth data in localStorage (another domain), so I have to show main window.
   2. There is no auth data, so I have to show window with login and password form.</p>
  
  <p>In order to define if auth data is presented, I would like to check his localStorage, but it looks like it's impossible. </p>
  
  <p>However, <code>chrome.storage.local.get</code> and <code>chrome.storage.local.set</code>works perfectly for localStorage of extension.</p>
  
  <p>Or is there approach to do this - get access to localStorage of another site ?</p>