Examine source code of Earth Hour

{
  "theme": {
    "images": {
      "theme_frame": "earth-hour-6-header.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Earth Hour",
  "manifest_version": 2,
  "description": "Visit <a href=\"https://outgoing.prod.mozaws.net/v1/07c4be3da77909d5a4751d43d272618eb83320ae3488028f71ae686efd256d5f/http%3A//www.earthhour.org\" rel=\"nofollow\">http://www.earthhour.org</a> to pledge your support for Earth Hour and turn out the lights for 1 hour at 8:30pm March 26, 2011.\n&lt;p&gt;\nThis year’s theme encourages people to 'go beyond the hour' to adopt a more sustainable lifestyle that uses less energy.\n&lt;p&gt;\nBy using a dark theme on your computer, you will reduce its energy consumption. Choose a dark desktop wallpaper, use a dark home page, and adopt a dark Firefox persona (like this one).\n&lt;p&gt;\nThis Earth Hour, go beyond the hour!\n&lt;/p&gt;"
}