Examine source code of Marian The Librarian

{
  "manifest_version": 3,
  "name": "Marian The Librarian",
  "version": "2.1.0",
  "description": "Extracts book details from Amazon product pages. Created for the fine librarian corps of Hardcover.app.",
  "author": "Jacob Tender",
  "homepage_url": "https://hardcover.app/join?referrer_id=8753",
  "host_permissions": [
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    "https://www.amazon.co.uk/*",
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    "https://www.amazon.com.be/*",
    "https://www.amazon.com.br/*",
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    "https://www.amazon.fr/*",
    "https://www.amazon.de/*",
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    "https://www.amazon.sa/*",
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    "https://www.amazon.es/*",
    "https://www.amazon.se/*",
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    "https://www.google.com/books/*",
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    "https://www.google.com.be/books/*",
    "https://www.google.com.br/books/*",
    "https://www.google.ca/books/*",
    "https://www.google.cn/books/*",
    "https://www.google.eg/books/*",
    "https://www.google.fr/books/*",
    "https://www.google.de/books/*",
    "https://www.google.in/books/*",
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    "https://www.google.pl/books/*",
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    "https://www.google.es/books/*",
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    "https://www.google.com.tr/books/*",
    "https://www.google.ae/books/*",
    "https://books.google.com/books/*",
    "https://books.google.co.uk/books/*",
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    "https://books.google.com.be/books/*",
    "https://books.google.com.br/books/*",
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    "https://books.google.eg/books/*",
    "https://books.google.fr/books/*",
    "https://books.google.de/books/*",
    "https://books.google.in/books/*",
    "https://books.google.co.jp/books/*",
    "https://books.google.com.mx/books/*",
    "https://books.google.nl/books/*",
    "https://books.google.pl/books/*",
    "https://books.google.sa/books/*",
    "https://books.google.sg/books/*",
    "https://books.google.es/books/*",
    "https://books.google.se/books/*",
    "https://books.google.com.tr/books/*",
    "https://books.google.ae/books/*",
    "https://www.goodreads.com/*",
    "https://app.thestorygraph.com/*",
    "https://beta.thestorygraph.com/*",
    "https://isbnsearch.org/*",
    "https://isbndb.com/*",
    "https://www.kobo.com/*",
    "https://libro.fm/*",
    "https://www.overdrive.com/*",
    "https://school.teachingbooks.net/*",
    "https://libbyapp.com/*",
    "https://share.libbyapp.com/*",
    "https://portal.dnb.de/*",
    "https://deposit.dnb.de/*",
    "https://www.isbn.de/*",
    "https://isbn.de/*",
    "https://www.abebooks.com/*",
    "https://www.zvab.com/*",
    "https://www.iberlibro.com/*",
    "https://www.abebooks.it/*",
    "https://www.abebooks.fr/",
    "https://www.abebooks.de/",
    "https://www.abebooks.co.uk/",
    "https://booksamillion.com/p/*",
    "https://www.booksamillion.com/p/*",
    "https://www.novelupdates.com/series/*",
    "https://www.mangaupdates.com/series/*",
    "https://www.scribblehub.com/series/*",
    "https://www.royalroad.com/fiction/*",
    "https://forums.spacebattles.com/threads/*",
    "https://www.fanfiction.net/s/*",
    "https://archiveofourown.org/works/*",
    "https://www.wattpad.com/story/*",
    "https://myanimelist.net/*",
    "https://www.anime-planet.com/manga/*",
    "https://kitsu.app/manga/*",
    "https://mangadex.org/title/*",
    "https://anilist.co/manga/*",
    "https://torpublishinggroup.com/*",
    "https://inventaire.io/entity/*",
    "https://search.worldcat.org/*",
    "https://www.librarything.com/work/*",
    "https://bookshop.org/p/books/*",
    "https://www.isfdb.org/cgi-bin/*",
    "https://www.romance.io/books/*",
    "https://www.barnesandnoble.com/*",
    "https://www.indiebookstores.ca/book/*",
    "https://openlibrary.org/*",
    "https://www.penguinrandomhouse.com/books/*"
  ],
  "icons": {
    "16": "icons/icon.png",
    "32": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "action": {
    "default_title": "Get Book Details"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "marian@jacobtender.net"
    }
  },
  "sidebar_action": {
    "default_icon": {
      "128": "icons/icon.png"
    },
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    "default_panel": "popup.html"
  },
  "permissions": [
    "downloads",
    "storage",
    "scripting",
    "tabs",
    "notifications"
  ]
}