It's not developer's fault but this extension keeps breaking and Mozilla's policy of updating add-ons is painfully slow, with all that in mind I suggest using Violentmonkey script. It's the exact same thing, using the same settings (you won't lose settings), that is updated much faster. This is a 5 star addon with 1 star issues caused by external factors.

it is completely useless, like every single Twitch add on, coded by inexperienced people and broken 90% of the time.

Breaking twitch so it doesnt work. The scripts also do not work. Their website doesnt work either. They refuse to acknowledge that its is breaking things with no fix in sight while they review blast people that comment its not working and pay to get reviews removed. I can provide SS proof that their addon does not work nor do their provided scripts with twitch.

They simply removed negative reviews!

Constant downtime. Fix ur servers u shits