Make an animated Chrome extension icon?

I am trying to make a new Chrome extension, and I need the icon to automatically change like a gif with an array of images, and repeat forever. My problem is I can't get the Javascript loop to work. Here is what I've got:

var min = 1;
var max = 12;
var current = min;

  if (current > max)
    current = min;
}

var keep_switching_icon = true;
function rotateIcon()
{               
   if ( keep_switching_icon )
   {
      chrome.browserAction.setIcon({path:"icon" + current + ".png"});
      current++;
      window.setTimeout(rotateIcon, 300);
   }
}

A few changes should be done:

1. Checking if current > max should be moved inside the function

console.clear();

var min = 1;
var max = 12;
var current = min;

var keep_switching_icon = true;

function rotateIcon() {
  if (keep_switching_icon) {
    //chrome.browserAction.setIcon({path:"icon" + current + ".png"});
    console.log(current);
    if (current++ > max) {
      current = min;
    };

    window.setTimeout(rotateIcon, 300);
  }
}

rotateIcon();

Just instead of console.log(current), uncomment your chrome.browserAction function call and delete the first line.