Examine source code of It diffuses.

{
  "theme": {
    "images": {
      "theme_frame": "1115-kao-1113.jpg"
    },
    "colors": {
      "frame": "#fad5d5",
      "tab_background_text": "#fcf7f7"
    }
  },
  "version": "2.0",
  "name": "It diffuses.",
  "manifest_version": 2,
  "description": "拡散していく。。"
}