it's good but just use the userscript version since mozilla is slow to approve updates

Error. FrankerFacez work in Firefox was not checked, so it was disabled.

Amazing app, been using for years and am stoked to finally see it in the FFox store! I think the #1 quality of life feature is the volume boost, amazing for quiet streams.
Quick tip for new users: if you're using BTTV / 7TV as well, make sure you only enable the emotes in one of your extensions

Truly a must-have for the twitch web client. Great accessibility tools, channel & personal moderation QoL, and extensions for BTTV/7TV Emotes without the bloat those extensions normally carry.