Examine source code of Klein_Matterhorn

{
  "theme": {
    "images": {
      "theme_frame": "Panorama_KleinMatterhorn_FirefoxPersona.jpg"
    },
    "colors": {
      "frame": "#6d6c73",
      "tab_background_text": "#0b156e"
    }
  },
  "version": "2.0",
  "name": "Klein_Matterhorn",
  "manifest_version": 2,
  "description": "View from Klein Matterhorn Mountain in Zermatt/Switzerland to famous Matterhorn."
}