It works very nicely, adding Unicode emojis to text-only email, and nice pictures for the corresponding emojis to html-formatted email. If I could suggest a "little" improvement: sometimes I want to add Unicode-emojis to html-email. Would it be possible, for instance, to shift-click the emoji as to get the text-emoji instead of the picture? I would love it even more! ;-)
This review is for a previous version of the add-on (1.3).