Examine source code of Rosette Nebula

{
  "theme": {
    "images": {
      "theme_frame": "RosetteNebulaheader.jpg"
    },
    "colors": {
      "frame": "#aaaaaa",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Rosette Nebula",
  "manifest_version": 2,
  "description": "This Persona shows the Rosette Nebula, using a public domain image on Wikimedia Commons (<a href=\"https://outgoing.prod.mozaws.net/v1/d90e56407f86d0314ba14ac03224b7b7b38c484302f9585b6c9bb2a12f2a298e/http%3A//commons.wikimedia.org/wiki/File%3ARedrosedust_wright_f2000.jpg\" rel=\"nofollow\">http://commons.wikimedia.org/wiki/File:Redrosedust_wright_f2000.jpg</a>)"
}