Examine source code of Wintergarden

{
  "theme": {
    "images": {
      "theme_frame": "winter-garten.jpg"
    },
    "colors": {
      "frame": "#7d1e09",
      "tab_background_text": "#fac60a"
    }
  },
  "version": "2.0",
  "name": "Wintergarden",
  "manifest_version": 2,
  "description": "Wintergarden Wittenberg Germany"
}