Examine source code of SEI Signature - Leitor A3

{
  "manifest_version": 3,
  "name": "SEI Signature - Leitor A3",
  "version": "1.0.1",
  "description": "Extensão para assinatura digital com certificado A3",
  "browser_specific_settings": {
    "gecko": {
      "id": "sei-signature@otimize-ti.com.br",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "nativeMessaging"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "inject.js"
      ],
      "world": "MAIN",
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}