edgeで非常に良かったのでfirefox乗り換え後も入れたのですが、firefoxだと何故かほんの少しだけページを広げるようで左右にスライダーが表示されます。
これのせいで矢印キーで早送りすると画面が動いて邪魔くさいです。

Fails to block some filtered titles even though the filter keyword is exactly as it appears in the title - case and all.

UPDATE:
It is possible that another extension (which I have since uninstalled) could have interfered with this, so I'll up my rating from 2 to 4 stars.
I stick to 4 stars and not 5 as the filtering is fairly limited compared to some other extensions I've used before but are sadly no longer being maintained. Regex filtering would have been awesome.