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')

No longer working as of about 2 weeks ago.

No longer works.

Doesn't work anymore