Examine source code of Herbst2012

{
  "theme": {
    "images": {
      "theme_frame": "KopfLaubJPEG.jpg"
    },
    "colors": {
      "frame": "#ede7e4",
      "tab_background_text": "#e3b716"
    }
  },
  "version": "2.0",
  "name": "Herbst2012",
  "manifest_version": 2
}