Examine source code of Thunderbird Lightplay

{
  "theme": {
    "images": {
      "theme_frame": "ThunderbirdLightplay01.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Thunderbird Lightplay",
  "manifest_version": 2,
  "description": "Credits : <a href=\"https://outgoing.prod.mozaws.net/v1/f8942287a808a24180a63ad029fb04917017748a0d0fcd91a1b0ce6129bb47ba/http%3A//deadpxl.deviantart.com/art/LightPlay-Wallpapers-67364442\" rel=\"nofollow\">http://deadpxl.deviantart.com/art/LightPlay-Wallpapers-67364442</a>"
}