Examine source code of Berlin - Spreebogen

{
  "theme": {
    "images": {
      "theme_frame": "Spreebogen_1.jpg"
    },
    "colors": {
      "frame": "#5e5e5e",
      "tab_background_text": "#969696"
    }
  },
  "version": "2.0",
  "name": "Berlin - Spreebogen",
  "manifest_version": 2,
  "description": "Germany, Berlin, Spreebogen"
}