Examine source code of Duke Nukem

{
  "theme": {
    "images": {
      "theme_frame": "persona_duke_nukem.png"
    },
    "colors": {
      "frame": "#a65a17",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Duke Nukem",
  "manifest_version": 2,
  "description": "A simple Persona for Duke Nukem fans !"
}