Examine source code of BookFinder PL

{
  "manifest_version": 3,
  "name": "BookFinder PL",
  "description": "Sprawdza dostępność książek z Lubimy Czytać i Goodreads w legalnych źródłach cyfrowych.",
  "version": "0.1.0",
  "icons": {
    "16": "icon-16.svg",
    "32": "icon-32.svg",
    "48": "icon-48.svg",
    "96": "icon-96.svg"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://lubimyczytac.pl/*",
    "https://www.goodreads.com/*",
    "https://www.legimi.pl/*",
    "https://www.storytel.com/*",
    "https://api.storytel.net/*"
  ],
  "optional_host_permissions": [
    "https://*/*"
  ],
  "incognito": "not_allowed",
  "action": {
    "default_title": "Ustawienia BookFinder PL",
    "default_icon": {
      "16": "icon-16.svg",
      "32": "icon-32.svg",
      "48": "icon-48.svg",
      "96": "icon-96.svg"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bookfinder-pl@bfinder.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "searchTerms"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://lubimyczytac.pl/ksiazka/*",
        "https://www.goodreads.com/book/show/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/bookfinder.js"
      ]
    }
  ]
}