Examine source code of Norway_holiday

{
  "theme": {
    "images": {
      "theme_frame": "Norway_firefox_header.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#8f0a0a"
    }
  },
  "version": "2.0",
  "name": "Norway_holiday",
  "manifest_version": 2,
  "description": "My holiday in Norway"
}