Examine source code of reSkroutzed

{
  "name": "reSkroutzed",
  "description": "reSkroutzed, is a must-have enhancer for website skroutz.gr",
  "version": "2.2.6",
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://www.skroutz.gr/*",
    "*://www.skroutz.ro/*",
    "*://www.skroutz.cy/*",
    "*://www.skroutz.de/*",
    "*://www.skroutz.eu/*",
    "*://www.bestprice.gr/*"
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.skroutz.gr/*",
        "https://www.skroutz.ro/*",
        "https://www.skroutz.cy/*",
        "https://www.skroutz.de/*",
        "https://www.skroutz.eu/*"
      ],
      "css": [
        "css/flaggerToggle.css",
        "css/productFlags.css",
        "css/shelfFlags.css",
        "css/style.css",
        "css/videoFlags.css",
        "css/darkModeToggle.css",
        "css/universalToggle.css"
      ],
      "js": [
        "background.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/48.png",
        "externalPaymentProviders/*.webp"
      ],
      "matches": [
        "https://www.skroutz.gr/*",
        "https://www.skroutz.ro/*",
        "https://www.skroutz.cy/*",
        "https://www.skroutz.de/*",
        "https://www.skroutz.bg/*",
        "https://www.skroutz.eu/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "/icons/48.png",
      "128": "/icons/128.png"
    }
  },
  "icons": {
    "48": "/icons/48.png",
    "128": "/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "skroutz-sponsored-flagger@itsiakkas.com",
      "strict_min_version": "109.0"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  }
}