Rated 3 out of 5 stars
This add-on DOES use Unicode characters. Like it should be. So it is better than the other one, which inserted images, and created a huge privacy leak.
BUT: It still inserts HTML, to display the images for users who have the add-on installed. Which makes no sense, since it is a waste of data for users who don’t have it installed, which is almost everyone.
Example: <span class="emojione e1-1F98A"><span>