Examine source code of Shard Tubes

{
  "theme": {
    "images": {
      "theme_frame": "ShardFirefoxTop.jpg"
    },
    "colors": {
      "frame": "#44acfc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Shard Tubes",
  "manifest_version": 2,
  "description": "A persona to celebrate Shard (<a href=\"https://outgoing.prod.mozaws.net/v1/0dfc2144a9a9536e303ce6a2b66900cb3ffa53c21ac6303462b2e0210aee2ec4/http%3A//shard.truebaptist.org\" rel=\"nofollow\">shard.truebaptist.org</a>).\n\nShard - We Play With Your Brain!"
}