There are a few important steps left and the extension can be used!
Pin the QR Scanner on tool panel
This is necessary in order to use the extension and always have quick access to it
Just click on the circle icon and start scanning QR codes.
1) Current tab - makes a screenshot of your screen. You can select any QR codes to scan.
2) Image - download your image of QR code
3) Camera - use your camera to scan any QR code