Examine source code of Webpage To Pdf file

{
  "manifest_version": 3,
  "name": "Webpage To Pdf",
  "version": "1.0.0",
  "description": "Save any webpage as clean PDF. Full page, article-only, or selected content. Preview before downloading. No account needed.",
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "downloads",
    "tabs",
    "notifications",
    "unlimitedStorage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "webpagetopdf@yourdomain.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "libs/Readability.js",
        "libs/html2canvas.min.js",
        "libs/jspdf.umd.min.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "preview.html",
        "history.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}