Examine source code of The clouds are playing. .

{
  "theme": {
    "images": {
      "theme_frame": "0702--pnkumo-oo.jpg"
    },
    "colors": {
      "frame": "#7deddc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "The clouds are playing. .",
  "manifest_version": 2,
  "description": "雲が遊んでいる。。\n\n\n\n0702--pnkumo-oo-●"
}