Examine source code of blue marble rain

{
  "theme": {
    "images": {
      "theme_frame": "down2500x200.htmlblueball.jpg"
    },
    "colors": {
      "frame": "#fcf7f7",
      "tab_background_text": "#0c0569"
    }
  },
  "version": "2.0",
  "name": "blue marble rain",
  "manifest_version": 2,
  "description": "imagine"
}