Examine source code of Become a cloud.

{
  "theme": {
    "images": {
      "theme_frame": "916-sky-tokeruribon---20p-sy.jpg"
    },
    "colors": {
      "frame": "#bbdff0",
      "tab_background_text": "#01030f"
    }
  },
  "version": "2.0",
  "name": "Become a cloud.",
  "manifest_version": 2,
  "description": "雲になって。。"
}