[Updated] Is sound OK for you here?

[space-time]

OK, more progress. when I said it happened in Safari earlier, that was because I had Firefox open.

After more troubleshooting, this only happens in Firefox. As long as Firefox is open and this page is loaded, even if I do not play the video, the sounds is bad (iTunes, Safari, etc). Firefox messes up the sound card when this page is loaded, even if that video is not playing.

EDIT:

EVEN MORE STRANGE!

If I play iTunes and I open that page in Firefox Private Window, sound in iTunes is fine. if I open that page in Firefox Normal Window (not private), sound is crappy.

Someone is spying on me.