Examine source code of Nau B-3

{
  "theme": {
    "images": {
      "theme_frame": "Mozillalogonaub-3.jpg"
    },
    "colors": {
      "frame": "#fc0505",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Nau B-3",
  "manifest_version": 2,
  "description": "Siempre salvajes!!!!"
}