About enabling QR code in the address bar
I found that Firefox can automatically generate a QR code for each URL, which is a powerful and useful feature! I'd like to know if this QR code has an expiration date.
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Android Firefox has a QR reader but I'm not aware of a QR generator. You can get DuckDuckGo to generate a QR code by searching for "qr <URL>".
Note that there are extensions that can generate a QR code. You can search the Add-ons website.