Examine source code of Invoice PDF Grabber

{
  "manifest_version": 3,
  "name": "Invoice PDF Grabber",
  "description": "Download invoices from ETA portal as PDF with one click. Simple, fast, and secure.",
  "version": "1.0.1",
  "content_scripts": [
    {
      "matches": [
        "*://invoicing.eta.gov.eg/*"
      ],
      "js": [
        "invoiceGrabber.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "helperCore.js",
        "jszip.min.js",
        "polyfill.js",
        "exceljs.min.js",
        "style.css",
        "bootstrap.min.css"
      ],
      "matches": [
        "*://invoicing.eta.gov.eg/*"
      ]
    }
  ],
  "permissions": [
    "https://invoicing.eta.gov.eg/"
  ],
  "icons": {
    "16": "logo16.png",
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "eta-invoice-grabber@example.com",
      "strict_min_version": "109.0"
    }
  }
}