That was referring to libflashsupport which you have installed.
Did you restart firefox after installing libflashsupport?
It was already installed - no idea how long, maybe since I first installed F8. I don't remember intentionally installing it.
Make sure the appropriate (SCM?) level is set in mixer.
My mixers are ok I think. I can hear sound in Flash and Audacious as long as they're not both running. If Flash is running and I try to play in Audacious I get a "can't access sound card" error. Oddly Xine and Flash don't fight though, so maybe this is just an Audacious bug. I wish Xine was a bit easier to use...
-sam