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Looking forward to a more polished UI. In particular, I'd like it to be visible at all times, and to highlight the "From" email's domain as either green (verified), orange (unsigned) or red (verified-wrong).
Your suggestions are added in version 0.4.0. If you don't mind installing a unreviewed version, you can download it already from https://addons.mozilla.org/addon/dkim-verifier/versions/