Examine source code of Hey Chicky

{
  "theme": {
    "images": {
      "theme_frame": "easter_firefox.jpg"
    },
    "colors": {
      "frame": "#27b1a4",
      "tab_background_text": "#333333"
    }
  },
  "version": "2.0",
  "name": "Hey Chicky",
  "manifest_version": 2,
  "description": "Easter fun from Calobee Doodles--visit <a href=\"https://outgoing.prod.mozaws.net/v1/5a9f07fd920906013ddad7e30a44707fe38586c8e9becf09083534393050bf1b/http%3A//www.calobeedoodles.com/\" rel=\"nofollow\">http://www.calobeedoodles.com/</a> for a free matching desktop wallpaper."
}