Examine source code of The Notebook-Lago-

{
  "theme": {
    "images": {
      "theme_frame": "1.jpg"
    },
    "colors": {
      "frame": "#fcf9f9",
      "tab_background_text": "#fcf7f7"
    }
  },
  "version": "2.0",
  "name": "The Notebook-Lago-",
  "manifest_version": 2
}