Examine source code of track fun

{
  "theme": {
    "images": {
      "theme_frame": "trackday2.jpg"
    },
    "colors": {
      "frame": "#1f0a5e",
      "tab_background_text": "#4a0404"
    }
  },
  "version": "2.0",
  "name": "track fun",
  "manifest_version": 2,
  "description": "smoke and black marks, signs of a good day"
}