Examine source code of QRLinkify

{
  "manifest_version": 2,
  "name": "QRLinkify",
  "version": "1.0.3",
  "description": "Instanly share links via QR code",
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "icons": {
    "48": "icons/ic_launcher.svg",
    "96": "icons/ic_launcher.svg"
  },
  "browser_action": {
    "default_icon": "icons/ic_launcher.svg",
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab"
  ]
}