SoundFixer 作者： Val Packett

It’s annoying when audio on some videos is set to one channel only, too quiet, or maybe even too loud? SoundFixer helps you fix an array of common audio issues associated with streaming video.

No more "Plug your headphones only halfway into the jack" :D

(Unfortunately, doesn't work on all websites — specifically, we're not allowed to use the Web Audio API from a cross-domain <audio> source. Thankfully, YouTube is not cross-domain!)