Examine source code of iOS 7 Default Wallpaper

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#34AADC",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "iOS 7 Default Wallpaper",
  "manifest_version": 2,
  "description": "Match your Firefox with the beautiful iOS default wallpaper. Along with the iOS 7 color pallet, carefully cropped and aligned for the best look and feel.\n\nTry the OS X Mavericks Default Wallpaper too!\n<a href=\"https://addons.mozilla.org/addon/os-x-mavericks-default/\" rel=\"nofollow\">https://addons.mozilla.org/addon/os-x-mavericks-default/</a>"
}