Examine source code of Color Feathers

{
  "theme": {
    "images": {
      "theme_frame": "Untitled.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#fcf29a"
    }
  },
  "version": "2.0",
  "name": "Color Feathers",
  "manifest_version": 2,
  "description": "with help from stelma <a href=\"https://outgoing.prod.mozaws.net/v1/61d449cf54f0e72c2889b114ea3652d3f348dbdfe27c6340a5ca4f6fc419e47e/http%3A//abstract.desktopnexus.com/wallpaper/674882/\" rel=\"nofollow\">http://abstract.desktopnexus.com/wallpaper/674882/</a> abstract, background, colorful, feathers, optimist, cheerful, love, happy, fashion"
}