Hi and thanks for your rating. It's great to hear that you like the add-on. 😀
From what I understand, you are having a problem with larger QR codes though.

I have to admit that the extension is not really tested and intended for big QR code contents and may not always work. It may even depend on your screen or browser size as there are limits on how big a popup window etc. can get.

If you continue to have problems with that, it would be very nice if you could report this bug on https://github.com/rugk/offline-qr-code/issues/, so we can deal with it. Thanks.
We transparently track issues there, so everyone can follow the progress or add more information.

I hope this explanation helped and continue to have fun using the extension.

Best regards,
rugk