Examine source code of Blue is Blue

{
  "theme": {
    "images": {
      "theme_frame": "BlueisBlueH.jpg"
    },
    "colors": {
      "frame": "#728fce",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Blue is Blue",
  "manifest_version": 2,
  "description": "bird, flowers, sparkle, glow, summer, spring, blue. My wallpaper to match can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/617f60abdffacbdc5130e5ee54daf5123f4a46abdfb67f988751e547d63c0b98/http%3A//nature.desktopnexus.com/wallpaper/698003/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/698003/</a>"
}