Examine source code of Modern Muscle

{
  "theme": {
    "images": {
      "theme_frame": "FirefoxHeader.jpg"
    },
    "colors": {
      "frame": "#9d9b9b",
      "tab_background_text": "#9d9b9b"
    }
  },
  "version": "2.0",
  "name": "Modern Muscle",
  "manifest_version": 2,
  "description": "Modern Muscle of Oswego IL.\n\nChicago Land Custom Specialists!\n\n<a href=\"https://outgoing.prod.mozaws.net/v1/b4c386636a2606f1a59fbd8edd1a719099ff2459c37af5dd369c6aa42eb57665/http%3A//www.modern-muscle.com\" rel=\"nofollow\">www.modern-muscle.com</a>"
}