Examine source code of Simple QR Code Scanner

{
  "manifest_version": 3,
  "name": "QR Code Scanner",
  "version": "1.0",
  "description": "Markiere einen QR-Code auf einer beliebigen Webseite, um den Text oder Link sofort im Browser auszulesen und zu kopieren.",
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "qr-scanner@Martin-He.de",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "QR Bereich auswählen",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jsQR.js",
        "content.js"
      ]
    }
  ]
}