Examine source code of eye_ball

{
  "theme": {
    "images": {
      "theme_frame": "eye_ball.png"
    },
    "colors": {
      "frame": "#cbd4ac",
      "tab_background_text": "#aba8a8"
    }
  },
  "version": "2.0",
  "name": "eye_ball",
  "manifest_version": 2,
  "description": "Animated eyeball looking around at stuff."
}