Makes the Twitch experience bearable and always has an option to disable any tiny thing I find that annoys me about twitch ui. It even allows you to revert changes when twitch puts you in A/B testing such as when they put titles above the player. I miss it that it has been broke for so long. Hoping mozilla approves the new update soon!

EDIT: It seems like the update has now been approved! It says 13 days ago(probably when the new version was submitted and put officially in the review queue). But it is in fact working with the latest version of Firefox.