Rated 4 out of 5 stars
Does not work on this beta version.This review is for a previous version of the add-on (1.7.0).
Please don't use the reviews to report problems. Use https://github.com/lieser/dkim_verifier/issues or write me an E-Mail.
See also https://addons.mozilla.org/en-US/review_guide
Have you tried the last pre-release from https://github.com/lieser/dkim_verifier/releases?