Examine source code of QR Code Reader Pro

{
  "name": "QR Code Reader",
  "description": "A chrome extension for reading QR code from webpage.",
  "version": "2.0.1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "options_page": "options.html",
  "browser_action": {
    "default_title": "QR Code Reader",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "images/icon.png",
    "48": "images/icon.png",
    "128": "images/icon.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "unlimitedStorage",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f2e85f3-3b5d-4905-afb0-c0f8c9f7336f}"
    }
  }
}