Examine source code of SmartMega

{
  "manifest_version": 3,
  "name": "SmartMega",
  "description": "Extensão não oficial para auxiliar o preenchimento de jogos da Mega-Sena no site loteriasonline.caixa.gov.br.",
  "version": "1.0.2",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "action": {
    "default_title": "SmartMega"
  },
  "permissions": [
    "scripting",
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "http://smartmega.com.br/*",
    "https://smartmega.com.br/*",
    "http://www.smartmega.com.br/*",
    "https://www.smartmega.com.br/*",
    "http://localhost/*",
    "https://localhost/*",
    "http://127.0.0.1/*",
    "https://127.0.0.1/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "smartmega@smartmega.com.br",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}