Examine source code of Denmark Summer

{
  "theme": {
    "images": {
      "theme_frame": "denmarka.jpg"
    },
    "colors": {
      "frame": "#666633",
      "tab_background_text": "#cc0000"
    }
  },
  "version": "2.0",
  "name": "Denmark Summer",
  "manifest_version": 2,
  "description": "The beautiful Danish island of Mon in the summertime"
}