Examine source code of Bloom. .

{
  "theme": {
    "images": {
      "theme_frame": "0203-hanasaku.jpg"
    },
    "colors": {
      "frame": "#f0c3e9",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Bloom. .",
  "manifest_version": 2,
  "description": "花咲く。。\n\n\n\n0203-hanasaku●"
}