Pros: Works on more sites than others, potentially. Cons: Doesn't give much control over fonts or backgrounds, to allow for good integration. Japanese subtitles don't include furigana like other dual subtitle extensions. It's good for the sites that others don't work on, but not as good as others.
Thanks for the review/feedback! Subs appearance setup feature will go to development soon. On furigana - will check it out, you are the first person who has asked about it.
