Examine source code of Enter2fa

{
  "description": "Puedes pulsar el botón de 'Aceptar' una vez introducido el codigo de doble autenticación al presionar Enter. Ver https://github.com/JimmyVaras/ev2fa-enter",
  "manifest_version": 2,
  "name": "Enter2fa",
  "version": "1.0",
  "homepage_url": "https://github.com/JimmyVaras/ev2fa-enter",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://sso.us.es/*"
      ],
      "js": [
        "enter2fa.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7fb9351c-96e3-4b65-bd00-783ade54ef50}"
    }
  }
}