Examine source code of Nexus War Tribute

{
  "theme": {
    "images": {
      "theme_frame": "WideNWpersonaBar.png"
    },
    "colors": {
      "frame": "#808080",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Nexus War Tribute",
  "manifest_version": 2,
  "description": "A tribute to the defunct browser-based game Nexus War. Logo and icons property of Jorm."
}