Examine source code of QR Menu

{
  "manifest_version": 2,
  "name": "QR Menu",
  "version": "0.2",
  "description": "Generates a QR code for the page you are currently on.",
  "icons": {
    "48": "icons/qrmenu-48.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/qrmenu-32.png",
    "default_title": "Generate QR Code",
    "default_popup": "popup/qrview.html"
  }
}