This extension is based on qrcode.js by davidshimjs: https://davidshimjs.github.io/qrcodejs/
More information:
https://www.quickandeasywebbuilder.com/extensions/index.php?file_id=225
You can also download the new extension through the Extension Manager (Menu->Tools->Extension Manager->Online Gallery).
Please read the included PDF documentation for instructions, license information, etc.