Examine source code of QR Reader — Scan from Page

{
  "manifest_version": 3,
  "name": "QR Reader",
  "version": "0.1.0",
  "description": "Select and decode QR codes directly from the page.",
  "icons": {
    "16": "icons/qr-reader-16.png",
    "32": "icons/qr-reader-32.png",
    "48": "icons/qr-reader-48.png",
    "128": "icons/qr-reader-128.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "QR Reader",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/qr-reader-16.png",
      "32": "icons/qr-reader-32.png",
      "48": "icons/qr-reader-48.png"
    }
  },
  "commands": {
    "scan-qr": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "Select a QR code on this page"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "qr-reader@example.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}