title: How to "hide" chrome extension local storage
body: <p>I'm developing an extension that is managed by server, and I need to store local data to use when Chrome is offline. I know it sounds terrible, but it's a management extension, I need it.  </p>
  
  <p>For this purpose I can use:<br>
  - chrome.storage API, but users can easily remove all data and my offline management fails.<br>
  - webSQL, same problem as chrome.storage.<br>
  - write a file, but users can still remove the file.  </p>
  
  <p>Is there something else that I can use that isn't easily removed by users?<br>
  Thanks</p>