PD gains control of Alsa, thus firefox cannot play audio.
Tha trick is using firefox through jack, and pd too. Search the archives of this mailing list, this has been talked - i recall. 

By the way, what you want is called Jack pulseaudio sink.

as here: http://www.youtube.com/watch?v=yjH1maNxR_M

:)
best regards

On Sat, Jan 15, 2011 at 3:15 PM, Pierre Massat <pimassat@gmail.com> wrote:
Hi list!

I just downloaded pd-extended .42 on ubuntu 10.04, and there's something strange (to me) :
I was listening to some music on a bandcamp page, and i installed pd and strated it to see if it was working alright. It is working alright indeed, but the music in bandcamp (in firefox) freezes when pd is running. It just stops playing, as if on pause. Everything works fine again when i close Pd.

Is this normal or is it some kind of a bug?

Pierre

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Pedro Lopes (MSc)
contact: pedro.lopes@ist.utl.pt
website: http://web.ist.utl.pt/Pedro.Lopes