Examine source code of Magic Circle

{
  "theme": {
    "images": {
      "theme_frame": "header2web.jpg"
    },
    "colors": {
      "frame": "#95a8c6",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "Magic Circle",
  "manifest_version": 2,
  "description": "Magical stone circle in Scotland."
}