Examine source code of Notel

{
  "manifest_version": 3,
  "name": "Notel",
  "version": "1.0.0",
  "description": "Filters fake and 4th-party hotel booking sites out of Google search results, and flags third-party OTAs so you book with the real hotel.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/search*",
        "*://www.google.ca/search*",
        "*://www.google.co.uk/search*",
        "*://www.google.com.au/search*",
        "*://www.google.co.nz/search*",
        "*://www.google.ie/search*",
        "*://www.google.de/search*",
        "*://www.google.fr/search*",
        "*://www.google.es/search*",
        "*://www.google.it/search*",
        "*://www.google.nl/search*",
        "*://www.google.be/search*",
        "*://www.google.at/search*",
        "*://www.google.ch/search*",
        "*://www.google.se/search*",
        "*://www.google.no/search*",
        "*://www.google.dk/search*",
        "*://www.google.fi/search*",
        "*://www.google.pt/search*",
        "*://www.google.pl/search*",
        "*://www.google.cz/search*",
        "*://www.google.gr/search*",
        "*://www.google.com.mx/search*",
        "*://www.google.com.br/search*",
        "*://www.google.co.in/search*",
        "*://www.google.co.jp/search*",
        "*://www.google.com.sg/search*",
        "*://www.google.com.hk/search*"
      ],
      "js": [
        "data/lists.js",
        "src/detector.js",
        "src/content.js"
      ],
      "css": [
        "src/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "notel@notel.extension",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}