Examine source code of Beautiful Butterfly

{
  "theme": {
    "images": {
      "theme_frame": "BeautifulButterflyH.jpg"
    },
    "colors": {
      "frame": "#4d4a4a",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Beautiful Butterfly",
  "manifest_version": 2,
  "description": "simple, butterfly, colorful, spring, summer, \n\nDesigned by MaDonna"
}