Works great for the most part but despite doing what everybody else has tried chat currently isn't working for me. You may have better luck, it's worked for other people, but apparently the fix is to allow 3rd party cookies. Didn't work for me, might work for you.

i created firefox account just to write this this review. twitch 5 is the only thing that fixed twitch buffering for me but for like a day now the chat is not working for some reason. this really a deal breaker and hampers twitch viewing experience. i urge the developer to look into this and fix it asap.
edit- i saw other reviews and see that people had this issue and fixed it by doing something related to cookies. can anybody help me with that