Examine source code of Namibia

{
  "theme": {
    "images": {
      "theme_frame": "Firefox2.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ff0000"
    }
  },
  "version": "2.0",
  "name": "Namibia",
  "manifest_version": 2,
  "description": "Namibia\nHeader Image: route between Duwisib and Sesriem\nFooter Image: German \"Rotel-bus\""
}