Examine source code of Robbie Williams poster

{
  "theme": {
    "images": {
      "theme_frame": "fels.jpg"
    },
    "colors": {
      "frame": "#11b024",
      "tab_background_text": "#49bf00"
    }
  },
  "version": "2.0",
  "name": "Robbie Williams poster",
  "manifest_version": 2
}