Examine source code of Earth in Space

{
  "theme": {
    "images": {
      "theme_frame": "mozilla_persona_erde.JPG"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Earth in Space",
  "manifest_version": 2,
  "description": "Roots: <a href=\"https://outgoing.prod.mozaws.net/v1/793965d2866d0054687f67fafe8a4a97d650f41ffa960d78bb5a265b3a91e7f0/http%3A//teddyjo.deviantart.com/%23/d2u2q95\" rel=\"nofollow\">http://teddyjo.deviantart.com/#/d2u2q95</a>"
}