Examine source code of Smiling Polar Bear

{
  "theme": {
    "images": {
      "theme_frame": "banner.jpg"
    },
    "colors": {
      "frame": "#594c4c",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Smiling Polar Bear",
  "manifest_version": 2,
  "description": "Polar bear on the Arctic ice. Image by Jerzy Strzelecki (<a href=\"https://outgoing.prod.mozaws.net/v1/5141753469a0c6985bd5765a3d892527ff780653943abdfb1dd838e5710d02ed/http%3A//commons.wikimedia.org/wiki/File%3APolar_Bear_%2528js%2529_1.jpg\" rel=\"nofollow\">http://commons.wikimedia.org/wiki/File:Polar_Bear_%28js%29_1.jpg</a>), used under Creative Commons attribution-share-alike license (<a href=\"https://outgoing.prod.mozaws.net/v1/016fc27d77a4fe1130f4bf3e7692560b3836db91ad6c3c67f1ef33cc2072c66a/http%3A//creativecommons.org/licenses/by-sa/3.0/deed.en\" rel=\"nofollow\">http://creativecommons.org/licenses/by-sa/3.0/deed.en</a>)"
}