Examine source code of Gocdkeys - Game Offers finder

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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Gocdkeys - Game Offers finder",
  "version": "1.4.5",
  "description": "The extension detects visits to digital game stores and provides you with the best offers from Gocdkeys.",
  "action": {
    "default_popup": "templates/popup.html",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "32": "assets/icons/icon-32.png",
      "48": "assets/icons/icon-48.png",
      "128": "assets/icons/icon-128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon-16.png",
    "32": "assets/icons/icon-32.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "permissions": [
    "webNavigation",
    "activeTab",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://gamecost.com/*",
    "https://www.gamecost.com/*",
    "https://api.gamecost.com/*",
    "https://store.steampowered.com/*",
    "https://www.g2a.com/*",
    "https://www.gamivo.com/*",
    "https://www.g2play.net/*",
    "https://www.kinguin.net/*",
    "https://www.eneba.com/*",
    "https://store.epicgames.com/*",
    "https://www.allkeyshop.com/*",
    "https://www.dlcompare.es/*",
    "https://www.dlcompare.com/*",
    "https://www.dlcompare.fr/*",
    "https://www.greenmangaming.com/*",
    "https://www.cdkeys.com/*",
    "https://www.clavecd.es/*",
    "https://www.goclecd.fr/*",
    "https://www.youtube.com/*",
    "https://www.mmoga.com/*",
    "https://www.mmoga.es/*"
  ],
  "background": {
    "service_worker": "src/background.js"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/images/brand-logo.svg",
        "templates/popup.html",
        "templates/configuration.html",
        "assets/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://store.steampowered.com/*",
        "https://www.g2a.com/*",
        "https://www.gamivo.com/*",
        "https://www.g2play.net/*",
        "https://www.kinguin.net/*",
        "https://www.eneba.com/*",
        "https://store.epicgames.com/*",
        "https://www.allkeyshop.com/*",
        "https://www.dlcompare.es/*",
        "https://www.dlcompare.com/*",
        "https://www.dlcompare.fr/*",
        "https://www.greenmangaming.com/*",
        "https://www.cdkeys.com/*",
        "https://www.clavecd.es/*",
        "https://www.goclecd.fr/*",
        "https://www.youtube.com/*",
        "https://www.mmoga.com/*",
        "https://www.mmoga.es/*",
        "https://www.instant-gaming.com/*"
      ],
      "js": [
        "src/enviroment.js",
        "src/lang/translations.js",
        "src/Class/TranslateHandler.js",
        "src/Class/DomainHandler.js",
        "src/Class/ChromeRuntimeHandler.js",
        "src/Class/ModalHandler.js",
        "src/Class/MainHandler.js",
        "handlers/comparators/MMOGAHandler.js",
        "handlers/comparators/AllKeyShopHandler.js",
        "handlers/stores/CDKeysHandler.js",
        "handlers/comparators/ClavecdHandler.js",
        "handlers/comparators/ClecdHandler.js",
        "handlers/comparators/DLCompareHandler.js",
        "handlers/stores/EpigGamesStoreHandler.js",
        "handlers/marketplaces/EnebaHandler.js",
        "handlers/marketplaces/G2AHandler.js",
        "handlers/stores/G2PlayHandler.js",
        "handlers/stores/GamivoHandler.js",
        "handlers/stores/KinguinHandler.js",
        "handlers/stores/GreenmangamingHandler.js",
        "handlers/stores/InstantGamingHandler.js",
        "handlers/stores/SteamHandler.js",
        "handlers/others/YoutubeHandler.js",
        "utils/utils.js",
        "src/content-script.js"
      ],
      "css": [
        "styles/styles.css"
      ]
    }
  ]
}