Examine source code of Eleven Concerts

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#666666",
      "tab_background_text": "#666666"
    }
  },
  "version": "2.0",
  "name": "Eleven Concerts",
  "manifest_version": 2,
  "description": "Eleven Concerts is the concert promotion department of Eleven Group SA, established in January 2009."
}