Examine source code of Cologne Richter Window

{
  "theme": {
    "images": {
      "theme_frame": "RichterDomfensterA.jpg"
    },
    "colors": {
      "frame": "#f0d1d1",
      "tab_background_text": "#f5f0f0"
    }
  },
  "version": "2.0",
  "name": "Cologne Richter Window",
  "manifest_version": 2,
  "description": "Gerhard Richter's stunning Window of Cologne Cathedral"
}