Examine source code of US 2FA Autofill

{
  "manifest_version": 3,
  "name": "US 2FA Autofill",
  "version": "4.1",
  "description": "Rellena automáticamente el código 2FA en la Universidad de Sevilla.",
  "permissions": [
    "storage"
  ],
  "background": {
    "service_worker": "scripts/background.js",
    "type": "module",
    "scripts": [
      "scripts/background.js"
    ]
  },
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "128": "images/USAutofill_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://sso.us.es/*"
      ],
      "js": [
        "scripts/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "host_permissions": [
    "https://sso.us.es/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{552d76df-199a-4058-a8ef-77478cad362f}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}