From time to time I receive Emails from friends with QR-codes containing geolocations.
It would be great if Thunderbird would have an option to decode the content of such a QR-code, e.g. after hovering with the mouse over it.
A left mouse click on such a QR code should open the contained URI in the application set forth for the scheme in it, e.g.
a right mouse click should copy the QR code's content to the clipboard.
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Of course EPC-QR codes would be another application for QR codes in received Emails.
On Linux systems you might use zbar-tools to implement it. It also decodes DMC and other barcode types.