Examine source code of Autumn Color

{
  "theme": {
    "images": {
      "theme_frame": "autumn-color-01.jpg"
    },
    "colors": {
      "frame": "#ffc861",
      "tab_background_text": "#73290e"
    }
  },
  "version": "2.0",
  "name": "Autumn Color",
  "manifest_version": 2,
  "description": "秋の色って、本当はもっと優しい。そしてとっても暖っかい。"
}