I see that there is already a suggestion for this for Thunderbird, but how about Firefox, too? I had just downloaded a PDF, and was viewing it in the Firefox viewer on my PC, and there were QR codes which (most likely) would take you to other web pages. But short of breaking out my phone and taking a shot with the camera of my monitor...or cut/save/paste the image into some online tool...I had no way to find out what the QR code would do. So, a proposal: There is already the screenshot capability. Perhaps add something that, after highlighting the area to capture, the system could detect whether a QR code was likely present. If so, add a "decode" button to the save/cancel buttons already in place. Upon clicking the button, it would attempt to decode, and if it were successful, have it show what the link or whatever it decodes to was, and if it is a link, perhaps run some query/tool to determine if it is flagged or suspicious (and note it as such), and have a button to allow the user to proceed to the link, or take whatever other action the QR code is meant for. Ultimately, give the user an idea of what the code is, and if it is potentially harmful, and let them decide whether to browse or display the information of the code.
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