Examine source code of Rilakkuma

{
  "theme": {
    "images": {
      "theme_frame": "test0.png"
    },
    "colors": {
      "frame": "#ffa8e8",
      "tab_background_text": "#f554aa"
    }
  },
  "version": "2.0",
  "name": "Rilakkuma",
  "manifest_version": 2,
  "description": "初製作・・・ダメダメでした。"
}