Works great with the current ESR version of Firefox.
[Update: Looks like it kind of already has this feature, even if possibly by accident?, set block size to it's max, 25, ... test with one letter verses a paragraph or so. What's the maximum number of characters it can do, or be displayed?]
It would be nice if there was an auto choose block size and error correct level so that the generated QR code perfectly fits within the screen on a display. (or manually selected within resolution and/or within physical size, and/or within fraction of display, etc...?)
Like if it's just a little bit of text, choose a larger block size than if it's a lot of text.
This would be helpful in cases where someone has a really high resolution display and and a crummy phone camera., etc... Maximizing the odds that the camera picks it up.
UPDATE: It would be nice if this were compatible with Firefox Quantum. Any chance this would work by the time the next firefox-esr officially comes out? (60.2)