title: How can I save information locally in my chrome extension?
body: <p>I want my chrome extension to save some information, and I'm not sure how to start the code...
  I need it to save strings. 
  For example - The user inputs a string (In a text area over the popup) and this string is shown on the popup. When the user exits it and returns I want the string to remain the same. 
  (I belive it has to save it)
  I don't want to save it on my server or anything like that, I want it to be saved on the users cache or something.</p>