Examine source code of cometboom

{
  "theme": {
    "images": {
      "theme_frame": "distantplanet.jpg"
    },
    "colors": {
      "frame": "#0b6b78",
      "tab_background_text": "#267311"
    }
  },
  "version": "2.0",
  "name": "cometboom",
  "manifest_version": 2,
  "description": "comet explosion"
}