Thanks for the hint with the console: And searching for the error message leads to Blocked from extracting canvas data because no user input was detected..

And, alas, I had set privacy.resistFingerprinting to true in about::config. Resetting it fixed the issue.

SN's QR generation doesn't trigger this, that's why I assumed the problem was on your end. My bad, and have a nice day!

The withdrawal QR code doesn't render properly in Firefox (where stackernews' does):

Excellent concept, there's something irresistable about clicking for sats.

By "buying" you mean I'm supposed to pay to unblur an image to see it?