Examine source code of First_Light

{
  "theme": {
    "images": {
      "theme_frame": "FirstLightHcopyCustom.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "First_Light",
  "manifest_version": 2,
  "description": "forest, green, trees, sun, beams, light, morning, daylight, streaks, My desktop wallpaper to match can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/71c301730be8e093ca98f35ff0a72abfea8d8c4644890b3d37c8f38ff3467efa/http%3A//nature.desktopnexus.com/wallpaper/653129/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/653129/</a>"
}