[SLUG] USB speakers play everything but web served files

[Mark <moc@xxxxxxxxxxxxxx>]

I am running debian and have just managed to stumble my way through getting 
some USB speakers to work. That is they work for system sounds, CDs, mp3 
files  but I get no sound from websites, flash files, you tube and the like.

I assume I am missing some iceweasel plug in, but everything seems to be there
any pointers?

Novice terminology appreciated

Thanks
Mark