title: chrome extension doesn't work on "about:blank" URL
body: <p>Why my extension doesn't work on "about:blank" URL?</p>
  
  <p>I've tried to add this into manifest.json:<br><br>
  <code>"permissions": [ "about:blank" ]</code><br><br>
  and<br><br>
  <code>"matches": [ "about:blank" ]</code><br><br>
  but it does not work...</p>