This extension can generate QR codes from the URL, selected text or links of the current website.
Wanna change the position of the generated QR code?
Use the [SHIFT + ↑], [SHIFT + ↓], [SHIFT + ←], [SHIFT + →] shortcuts to push the QR Code in one of the display edges.
Use the [ALT + F] shortcut to toggle between a fullsize view of the generated QR code.