Examine source code of Zero Gravity V1

{
  "theme": {
    "images": {
      "theme_frame": "Zero_Gravity.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Zero Gravity V1",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/37cdf6a35128fa4680bafec12df8be7e1b875eebdcd895114008b79487a1d1e9/http%3A//www.zerogravitydriftrc.com.br/\" rel=\"nofollow\">http://www.zerogravitydriftrc.com.br/</a>"
}