Examine source code of Nuages

{
  "theme": {
    "images": {
      "theme_frame": "nuagespersonna.jpg"
    },
    "colors": {
      "frame": "#5e5c5c",
      "tab_background_text": "#524f4f"
    }
  },
  "version": "2.0",
  "name": "Nuages",
  "manifest_version": 2
}