title: Chrome Browser Action Popup and icon switch does not work
body: <p>While using a default popup for my Chrome extension, I can't change the icon for the state of the extension. If I disable the popup.html the state changing icons are working. I used a toggle method for changing the icons, which worked perfectly before without using the popup.html.
  How is that possible? Can anyone help me please?</p>
  
  <p>thanks in advance!</p>