Examine source code of Thanksgiving Owls

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#f0ebda",
      "tab_background_text": "#520000"
    }
  },
  "version": "2.0",
  "name": "Thanksgiving Owls",
  "manifest_version": 2,
  "description": "Cute, whimsical owls sitting in a tree for Thanksgiving.\n\nImage credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/77c3cc6c336689a7ff913ca73ce05081df94e5c4886028ed557d21b2ca1c5e18/http%3A//www.vectortreats.com/\">http://www.vectortreats.com/</a>"
}