Examine source code of Londoin 2012

{
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    "images": {
      "theme_frame": "firefox_header.jpg"
    },
    "colors": {
      "frame": "#e3c7c7",
      "tab_background_text": "#d4aaaa"
    }
  },
  "version": "2.0",
  "name": "Londoin 2012",
  "manifest_version": 2,
  "description": "Summer 2012 in London"
}