Examine source code of Berlin Subway

{
  "theme": {
    "images": {
      "theme_frame": "header_subway_artsy.jpg"
    },
    "colors": {
      "frame": "#ede5b0",
      "tab_background_text": "#2f033b"
    }
  },
  "version": "2.0",
  "name": "Berlin Subway",
  "manifest_version": 2,
  "description": "this is an artsy interpretation of a shot I took of a Berlin subway train (Line U6, Station Friedrichstraße).\nI hope you'll enjoy it. =)"
}