the extension has been fixed! if you are still not seeing the pronouns show up in twitch, please Remove the addon, then Add to Firefox again, and restart your browser :D
(unless you also use FFZ, which has a clash at the moment, but you can make the pronouns show up inside FFZ by going to the FFZ settings, search for 'pronouns')

easy to use with a clear interface, plus helps you connect with people in chat better as you know how to address them.

Great extension! Big big fan of pronouns and all of those "pronoun users" they're my favorite

Easy to set up and easy to use! Someone in a stream chat I was in recommended it and it works great!