Examine source code of Summer Grass

{
  "theme": {
    "images": {
      "theme_frame": "Header.jpg"
    },
    "colors": {
      "frame": "#4f4f4f",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "Summer Grass",
  "manifest_version": 2,
  "description": "Matching Wallpaper <a href=\"https://outgoing.prod.mozaws.net/v1/5eaa1a950ba019c260dd66a19bc0a04ca0a04881412db88afcbfc258f45bc5c4/http%3A//sinine88.deviantart.com/art/Grass-209075928\" rel=\"nofollow\">http://sinine88.deviantart.com/art/Grass-209075928</a>"
}