Examine source code of Gretta Nerd Herd

{
  "theme": {
    "images": {
      "theme_frame": "Gretta-header.jpg"
    },
    "colors": {
      "frame": "#333333",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Gretta Nerd Herd",
  "manifest_version": 2,
  "description": "Summer Glau as Gretta on the tv show Chuck"
}