Rated 5 out of 5 stars

Improvement: Middle-clicking the button should open the addon's options. Right-clicking should allow to swapping between the source that generates the QR Code / Data Matrix. You could even allow scrolling up or down on the button (if it's possible) to changed the size of the output; the current size indicated by some pixel font letters on the button.

Works as advertised.

This review is for a previous version of the add-on (