Examine source code of smile leaves

{
  "theme": {
    "images": {
      "theme_frame": "smileleaves_01.jpg"
    },
    "colors": {
      "frame": "#ffc400",
      "tab_background_text": "#f7f586"
    }
  },
  "version": "2.0",
  "name": "smile leaves",
  "manifest_version": 2,
  "description": "もうすぐ冬。小春日和の暖かな日差しに、心が和んで溶け出しそう。\n色鮮やかな楽しい季節をありがとう！"
}