Examine source code of Polytoria token Login

{
  "manifest_version": 3,
  "name": "Polytoria token Login",
  "version": "1.0",
  "description": "Polytoriaでトークンログインを可能にします",
  "permissions": [
    "cookies",
    "activeTab",
    "clipboardWrite"
  ],
  "host_permissions": [
    "https://*.polytoria.com/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.polytoria.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9f3c2a1-7b6e-4c3d-9a8b-1e2f3a4b5c6d}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}