Examine source code of Dolar Blue

{
  "manifest_version": 3,
  "name": "Dolar Blue",
  "description": "Precio del dolar en Argentina.",
  "version": "1.2",
  "action": {
    "default_popup": "index.html",
    "default_icon": "./dolar.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "joa22714@gmail.com"
    }
  }
}