Examine source code of Boston At Night

{
  "theme": {
    "images": {
      "theme_frame": "skyline4.jpg"
    },
    "colors": {
      "frame": "#969696",
      "tab_background_text": "#a8f5fa"
    }
  },
  "version": "2.0",
  "name": "Boston At Night",
  "manifest_version": 2,
  "description": "The fabulous Boston skyline, featuring the Prudential Tower, Hancock tower and the Citgo sign."
}