Examine source code of kinder_weihnachten

{
  "theme": {
    "images": {
      "theme_frame": "firefox_banner_weihn_o.jpg"
    },
    "colors": {
      "frame": "#8f8989",
      "tab_background_text": "#141010"
    }
  },
  "version": "2.0",
  "name": "kinder_weihnachten",
  "manifest_version": 2,
  "description": "kinder weihnachten"
}