Examine source code of QR Code Reader

{
  "manifest_version": 3,
  "version": "0.3.2",
  "name": "QR Code Reader",
  "description": "a multiple QR- and bar-code scanner that supports scanning from webcam and local images",
  "permissions": [
    "storage",
    "contextMenus",
    "declarativeNetRequestWithHostAccess"
  ],
  "optional_permissions": [
    "sidePanel"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "background": {
    "service_worker": "worker.js",
    "scripts": [
      "worker.js"
    ]
  },
  "homepage_url": "https://webextension.org/listing/qrcode-reader.html",
  "icons": {
    "16": "data/icons/16.png",
    "19": "data/icons/19.png",
    "32": "data/icons/32.png",
    "38": "data/icons/38.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "192": "data/icons/192.png",
    "256": "data/icons/256.png",
    "512": "data/icons/512.png"
  },
  "action": {},
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
  },
  "commands": {
    "_execute_action": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62391615-4d17-4257-919b-369c26a4e628}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}