Examine source code of QRBot

{
  "manifest_version": 2,
  "name": "QRBot",
  "version": "1.1",
  "description": "Offline QR code generator",
  "author": "Kevin R",
  "homepage_url": "https://github.com/squidpickles/qrbot",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/icon-32.png",
    "default_title": "QRBot",
    "default_popup": "popup/qrpopup.html"
  }
}