Examine source code of Nx zero_.

{
  "theme": {
    "images": {
      "theme_frame": "personaok.jpg"
    },
    "colors": {
      "frame": "#2924c7",
      "tab_background_text": "#1d0ac9"
    }
  },
  "version": "2.0",
  "name": "Nx zero_.",
  "manifest_version": 2,
  "description": "i love nx"
}