I respect you since you are the original author, but there are several things I'd like to clarify. I initially reported a serve memory leaking issue with the fix to you via email, long before the release of Fx57 which removed all non-we extensions. I even DM'd you in case you missed it, but you didn't release the fix. Then I noticed that the extension was released under the MPL (which I can't appreciate more), so I forked it and ported it to WebExtension.

Anyway, I am not using this extension myself anymore, but some others are. As far as the license concerns, I don't think I did anything wrong, and I will not remove it for the sake of existing users.