Examine source code of Clouds At Sun Set

{
  "theme": {
    "images": {
      "theme_frame": "CloudsAtSunset.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Clouds At Sun Set",
  "manifest_version": 2,
  "description": "Another beautiful sunset, this one with an added texture of clouds."
}