Examine source code of Travel Experience Cleaner

{
  "manifest_version": 3,
  "name": "Travel Experience Cleaner",
  "version": "1.0.4",
  "description": "Unchecks promotional checkboxes and hotel search options on travel booking websites like Trainline, FlixBus, and Skyscanner",
  "icons": {
    "32": "assets/icon-32.png",
    "64": "assets/icon-64.png",
    "128": "assets/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e04d3fb-7f95-423c-9cf8-d7a819629364}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.thetrainline.com/*",
        "*://es-us.flixbus.com/*",
        "*://fr.flixbus.be/*",
        "*://fr.flixbus.ca/*",
        "*://fr.flixbus.ch/*",
        "*://global.flixbus.com/*",
        "*://it.flixbus.ch/*",
        "*://www.flix.com.mx/*",
        "*://www.flixbus.al/*",
        "*://www.flixbus.at/*",
        "*://www.flixbus.ba/*",
        "*://www.flixbus.be/*",
        "*://www.flixbus.bg/*",
        "*://www.flixbus.ca/*",
        "*://www.flixbus.cat/*",
        "*://www.flixbus.ch/*",
        "*://www.flixbus.cl/*",
        "*://www.flixbus.co.uk/*",
        "*://www.flixbus.com/*",
        "*://www.flixbus.com.au/*",
        "*://www.flixbus.com.br/*",
        "*://www.flixbus.com.tr/*",
        "*://www.flixbus.cz/*",
        "*://www.flixbus.de/*",
        "*://www.flixbus.dk/*",
        "*://www.flixbus.ee/*",
        "*://www.flixbus.es/*",
        "*://www.flixbus.fi/*",
        "*://www.flixbus.fr/*",
        "*://www.flixbus.gr/*",
        "*://www.flixbus.hr/*",
        "*://www.flixbus.hu/*",
        "*://www.flixbus.ie/*",
        "*://www.flixbus.in/*",
        "*://www.flixbus.it/*",
        "*://www.flixbus.lt/*",
        "*://www.flixbus.lv/*",
        "*://www.flixbus.mk/*",
        "*://www.flixbus.nl/*",
        "*://www.flixbus.no/*",
        "*://www.flixbus.pl/*",
        "*://www.flixbus.pt/*",
        "*://www.flixbus.ro/*",
        "*://www.flixbus.rs/*",
        "*://www.flixbus.se/*",
        "*://www.flixbus.si/*",
        "*://www.flixbus.sk/*",
        "*://www.flixbus.ua/*",
        "*://zh-us.flixbus.com/*",
        "*://gr.skyscanner.com/*",
        "*://ru.skyscanner.com/*",
        "*://www.espanol.skyscanner.com/*",
        "*://www.skyscanner.ae/*",
        "*://www.skyscanner.at/*",
        "*://www.skyscanner.ca/*",
        "*://www.skyscanner.ch/*",
        "*://www.skyscanner.co.id/*",
        "*://www.skyscanner.co.il/*",
        "*://www.skyscanner.co.in/*",
        "*://www.skyscanner.co.kr/*",
        "*://www.skyscanner.co.nz/*",
        "*://www.skyscanner.co.th/*",
        "*://www.skyscanner.co.za/*",
        "*://www.skyscanner.com/*",
        "*://www.skyscanner.com.ar/*",
        "*://www.skyscanner.com.au/*",
        "*://www.skyscanner.com.br/*",
        "*://www.skyscanner.com.co/*",
        "*://www.skyscanner.com.eg/*",
        "*://www.skyscanner.com.hk/*",
        "*://www.skyscanner.com.mx/*",
        "*://www.skyscanner.com.my/*",
        "*://www.skyscanner.com.ph/*",
        "*://www.skyscanner.com.sa/*",
        "*://www.skyscanner.com.sg/*",
        "*://www.skyscanner.com.tr/*",
        "*://www.skyscanner.com.tw/*",
        "*://www.skyscanner.com.ua/*",
        "*://www.skyscanner.com.vn/*",
        "*://www.skyscanner.cz/*",
        "*://www.skyscanner.de/*",
        "*://www.skyscanner.dk/*",
        "*://www.skyscanner.es/*",
        "*://www.skyscanner.fi/*",
        "*://www.skyscanner.fr/*",
        "*://www.skyscanner.gg/*",
        "*://www.skyscanner.hr/*",
        "*://www.skyscanner.hu/*",
        "*://www.skyscanner.ie/*",
        "*://www.skyscanner.it/*",
        "*://www.skyscanner.jp/*",
        "*://www.skyscanner.net/*",
        "*://www.skyscanner.nl/*",
        "*://www.skyscanner.no/*",
        "*://www.skyscanner.pk/*",
        "*://www.skyscanner.pl/*",
        "*://www.skyscanner.pt/*",
        "*://www.skyscanner.qa/*",
        "*://www.skyscanner.ro/*",
        "*://www.skyscanner.se/*",
        "*://www.skyscanner.sk/*",
        "*://www.tianxun.com/*",
        "*://www.es.momondo.com/*",
        "*://www.fr.momondo.be/*",
        "*://www.fr.momondo.ca/*",
        "*://www.fr.momondo.ch/*",
        "*://www.it.momondo.ch/*",
        "*://www.momondo.at/*",
        "*://www.momondo.be/*",
        "*://www.momondo.ca/*",
        "*://www.momondo.ch/*",
        "*://www.momondo.cl/*",
        "*://www.momondo.co.uk/*",
        "*://www.momondo.co.za/*",
        "*://www.momondo.com/*",
        "*://www.momondo.com.au/*",
        "*://www.momondo.com.br/*",
        "*://www.momondo.com.co/*",
        "*://www.momondo.com.pe/*",
        "*://www.momondo.com.tr/*",
        "*://www.momondo.cz/*",
        "*://www.momondo.de/*",
        "*://www.momondo.dk/*",
        "*://www.momondo.ee/*",
        "*://www.momondo.es/*",
        "*://www.momondo.fi/*",
        "*://www.momondo.fr/*",
        "*://www.momondo.ie/*",
        "*://www.momondo.in/*",
        "*://www.momondo.it/*",
        "*://www.momondo.mx/*",
        "*://www.momondo.nl/*",
        "*://www.momondo.no/*",
        "*://www.momondo.pl/*",
        "*://www.momondo.pt/*",
        "*://www.momondo.ro/*",
        "*://www.momondo.se/*",
        "*://www.momondo.ua/*",
        "*://www.ru.momondo.ua/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}