Examine source code of Gloomy dawn

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#424242",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Gloomy dawn",
  "manifest_version": 2,
  "description": "Taken at the face of sea, mahabalipuram"
}