Thanks for your rating. Actually, you can adjust the error correction level in the settings of the add-on. By default, it is set to “Q”. Right-click on the add-on icon in the toolbar and choose "Manage extension" (or similar in your language).

If this solves your problem it would be glad if you could adjust your voting.

Thanks. Actually you can save the QR code locally on your computer. Just right-click on it. See https://github.com/rugk/offline-qr-code/wiki/FAQ#how-to-save-the-qr-code-on-disk
It would be glad if you could upgrade your voting to 5 stars if that solves your problem.