Since upgrading to Firefox 23.0.1, I noticed I was having intermittent issues with no audio in Youtube videos. I have since discovered that, if I go to youtube to watch a video, there is no audio. The weird thing about this, though, if the video is linked through a forum, and I watch it embedded through that forum, it works fine.
Other video sites (test site linked in the FAQ and the videos on mozilla) work fine. If I open the youtube video in IE, it works fine.
I've tried searching these forums and the internet in general, but I'm not seeing anything similar.
I didn't find the right solution from the Internet.