Examine source code of quickly QR

{
  "description": "Generate a QR code for you current page.",
  "manifest_version": 2,
  "author": "J. David Zambrano Lizarazo",
  "name": "quickly QR",
  "version": "1.1.1",
  "homepage_url": "https://github.com/*****",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "theme_icons": [
      {
        "light": "icons/icon2.png",
        "dark": "icons/icon2.png",
        "size": 32
      }
    ],
    "default_title": "quickly QR",
    "default_popup": "popup/index.html"
  }
}