Examine source code of Animated Flying Witch

{
  "theme": {
    "images": {
      "theme_frame": "header45.png"
    },
    "colors": {
      "frame": "#d9d5d5",
      "tab_background_text": "#f2e96a"
    }
  },
  "version": "2.0",
  "name": "Animated Flying Witch",
  "manifest_version": 2,
  "description": "A little animated lightning ending with a flying witch across the moon"
}