Examine source code of Parkour Cityscape

{
  "theme": {
    "images": {
      "theme_frame": "park_header.jpg"
    },
    "colors": {
      "frame": "#6b0000",
      "tab_background_text": "#ff0000"
    }
  },
  "version": "2.0",
  "name": "Parkour Cityscape",
  "manifest_version": 2,
  "description": "A mix of parkour and a cityscape.  That's about it.  Not much to it, really."
}