Idea: QR scanner not working when a hostname does not contain "http" or "https". This is a good idea. But, it should also work when "HTTP" and "HTTPS". Because, some QRs are generated with "HTTP" and "HTTPS".
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FYI: This looks like a bug, so I've submitted a bug report.
This work was done in April and shipped with Firefox 101
Upgrading this to 'Delivered' as it was shipped in Firefox 101.
-The Community Team