Examine source code of Wikipedia Race

{
  "manifest_version": 3,
  "name": "Wikipedia Race",
  "version": "1.9",
  "description": "A Firefox extension to play a Wikipedia Race game with a persistent game tab.",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "webRequest",
    "scripting"
  ],
  "host_permissions": [
    "https://en.wikipedia.org/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://en.wikipedia.org/wiki/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "game.html",
        "game.css",
        "game.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "48": "icons/wikipedia_icon_48.png",
    "128": "icons/wikipedia_icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wikipedia-race@example.com",
      "strict_min_version": "109.0"
    }
  }
}