Examine source code of NfseCloud - Portal NFS-e

{
  "manifest_version": 3,
  "name": "NfseCloud – Portal NFS-e",
  "version": "2.0.1",
  "incognito": "spanning",
  "description": "Baixe XMLs e PDFs de NFSe via API do Portal Nacional. Filtre por competência, salve em ZIP, gere relatórios e exporte em Excel",
  "browser_specific_settings": {
    "gecko": {
      "id": "nfsecloud@coutodesenvolvimento.com.br",
      "strict_min_version": "115.0"
    }
  },
  "permissions": [
    "scripting",
    "downloads",
    "storage",
    "activeTab",
    "alarms",
    "tabs"
  ],
  "host_permissions": [
    "https://www.nfse.gov.br/*",
    "https://certificado.nfse.gov.br/*",
    "https://brasilapi.com.br/*",
    "https://adn.nfse.gov.br/*",
    "https://sefin.nfse.gov.br/*",
    "https://cad.svrs.rs.gov.br/*",
    "https://dfe-portal.svrs.rs.gov.br/*",
    "https://*.acesso.gov.br/*",
    "https://*.receita.fazenda.gov.br/*",
    "https://*.esocial.gov.br/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.receita.fazenda.gov.br/*",
        "https://*.esocial.gov.br/*"
      ],
      "js": [
        "ecac_content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "sidebar_action": {
    "default_panel": "popup.html",
    "default_icon": {
      "16": "icons/dark/icon_dark_16.png",
      "32": "icons/dark/icon_dark_32.png",
      "48": "icons/dark/icon_dark_48.png",
      "128": "icons/dark/icon_dark_128.png"
    }
  },
  "action": {
    "default_icon": {
      "16": "icons/dark/icon_dark_16.png",
      "32": "icons/dark/icon_dark_32.png",
      "48": "icons/dark/icon_dark_48.png",
      "128": "icons/dark/icon_dark_128.png"
    }
  },
  "background": {
    "scripts": [
      "logger.js",
      "db-config.js",
      "db-bridge.js",
      "libs/pdf-lib.min.js",
      "libs/qrcode.min.js",
      "nfsepdf2/fontkit.umd.js",
      "libs/jszip.min.js",
      "libs/xlsx.min.js",
      "relatorios.js",
      "nfse-mapa-nacional.js",
      "tributacao-engine.js",
      "report-engine.js",
      "prestadorService.js",
      "pdfService.js",
      "pdfServiceTomados.js",
      "content.js",
      "offscreen.js",
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/dark/icon_dark_16.png",
    "32": "icons/dark/icon_dark_32.png",
    "48": "icons/dark/icon_dark_48.png",
    "128": "icons/dark/icon_dark_128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; connect-src 'self' blob: https://www.nfse.gov.br https://brasilapi.com.br https://adn.nfse.gov.br https://sefin.nfse.gov.br https://cad.svrs.rs.gov.br https://dfe-portal.svrs.rs.gov.br https://sso.acesso.gov.br"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "nfse-mapa-nacional.js",
        "tributacao-engine.js",
        "icons/dark/icon_dark_128.png",
        "icons/light/icon_light_128.png",
        "icons/light/icon_light_1024.png"
      ],
      "matches": [
        "https://www.nfse.gov.br/*"
      ]
    },
    {
      "resources": [
        "visualizar-pdf.html"
      ],
      "matches": [
        "https://nfsecloud-redirect.nfsecloudbr.workers.dev/*"
      ]
    }
  ]
}