Examine source code of Halloween Sky

{
  "theme": {
    "images": {
      "theme_frame": "header505.jpg"
    },
    "colors": {
      "frame": "#d4cdcd",
      "tab_background_text": "#ff6600"
    }
  },
  "version": "2.0",
  "name": "Halloween Sky",
  "manifest_version": 2,
  "description": "Halloween skies, birds and trees."
}