Examine source code of pdf-hustler

{
  "manifest_version": 3,
  "name": "Smart PDF Downloader",
  "version": "1.0.1",
  "description": "Downloads dynamically loaded PDFs from viewers.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8582833b-10f0-4aa7-a359-f4f4284771dd}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "downloads",
    "webRequest",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  }
}