In my work as a teacher it would be very helpful for me, if I could choose one of my bookmarks, open the bookmark properties, click a button and have a little qr-code window I can show to my students, so they can open same page for their work ....
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This addon displays a QR code icon in the adress bar. https://addons.mozilla.org/de/firefox/addon/qr-code-address-bar
I think it would be useful though, to have something like that natively implemented
A built-in "share as QR code" option would be really useful, they could probably customize it so there is a fox or Firefox logo in the middle as Google does with their dinosaur QR codes on Chrome.