Examine source code of Red Planets

{
  "theme": {
    "images": {
      "theme_frame": "mozilla_persona_red_planet.JPG"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Red Planets",
  "manifest_version": 2,
  "description": "Roots: <a href=\"https://outgoing.prod.mozaws.net/v1/7200a3ce477ebe80ae5fbafff52372f361eda2a785937797bd25423772601b21/http%3A//teddyjo.deviantart.com/%23/d2ttee7\" rel=\"nofollow\">http://teddyjo.deviantart.com/#/d2ttee7</a>"
}