Examine source code of BestKabu

{
  "name": "BestKabu",
  "description": "BestKabu: Improve your experience of digikabu.de",
  "version": "2.1.3",
  "manifest_version": 3,
  "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",
      "128": "/icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bestKabu@lilith.de",
      "strict_min_version": "111.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.digikabu.de/*",
        "http://*.digikabu.de/*",
        "https://digikabu.de/*",
        "http://digikabu.de/*"
      ],
      "js": [
        "logic/controller.js",
        "logic/init.js",
        "logic/facade.js",
        "logic/popupCom.js",
        "logic/properties.js",
        "logic/storage.js",
        "logic/utils.js",
        "logic/models.js"
      ],
      "css": [
        "init.css"
      ]
    }
  ]
}