Examine source code of GuitarRank

{
  "theme": {
    "images": {
      "theme_frame": "guit1.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#f7f4f4"
    }
  },
  "version": "2.0",
  "name": "GuitarRank",
  "manifest_version": 2,
  "description": "guitars guitar cyco star a b  c d e f g h i j k l ñ z x c v b n m q w e r t y u i o p"
}