Examine source code of Green eco background

{
  "theme": {
    "images": {
      "theme_frame": "6-0.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Green eco background",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/f6ddeaf50e016843367782dcc8a499bf89502d3ff51d5ecd79310fe37e1973e3/http%3A//www.shutterstock.com/gallery-228157p1.html\" rel=\"nofollow\">http://www.shutterstock.com/gallery-228157p1.html</a>"
}