Examine source code of Abstract matrix

{
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    "images": {
      "theme_frame": "abstractmatrixheader.jpg"
    },
    "colors": {
      "frame": "#c0c0c0",
      "tab_background_text": "#00cccc"
    }
  },
  "version": "2.0",
  "name": "Abstract matrix",
  "manifest_version": 2,
  "description": "image from <a href=\"https://outgoing.prod.mozaws.net/v1/eb6ecd8a6cb5d975c58bd621c99369a8628b18c03398a8585c9f70a9b6399379/http%3A//www.photo-libre.fr\" rel=\"nofollow\">http://www.photo-libre.fr</a>"
}