Great player with a lot of thought put into it, but one star ding for lack of pop-out video support via Firefox picture-in-picture. ( https://support.mozilla.org/en-US/kb/about-picture-picture-firefox )

UPDATE: It seems raiding doesn't function correctly, when the twitch channel raids another channel it doesn't swap to that channel's video feed when the first one stops broadcasting. The chat does swap, however.