Examine source code of first berlin try

{
  "theme": {
    "images": {
      "theme_frame": "Unbenannt-1.jpg"
    },
    "colors": {
      "frame": "#050101",
      "tab_background_text": "#909ed1"
    }
  },
  "version": "2.0",
  "name": "first berlin try",
  "manifest_version": 2,
  "description": "just a try. berlin skyline"
}