As others have mentioned, this addon hijacks cmd+Q shortcut even on macOS. A patch was submitted and even merged on github less than a month after release, but the update never made it here, in the 6 years since. Shame.

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Good on windows, bad on mac. On windows it's very nice to me, but on mac, when used command+q to quit firefox, it poped qr-code-util, bad experience.