Examine source code of Inside Sim Racing

{
  "theme": {
    "images": {
      "theme_frame": "isr_header1.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Inside Sim Racing",
  "manifest_version": 2,
  "description": "Made for the great site <a href=\"https://outgoing.prod.mozaws.net/v1/6499c8cb13cc9379a6f5baf5c2e8494547589f0b658190a9fc16ff5afc1f5b68/http%3A//InsideSimRacing.tv\" rel=\"nofollow\">InsideSimRacing.tv</a>"
}