There seem to be several bugs out there related to this one, including bug 254405 and 353498 (which I reported). I first noticed this problem as far back as Hardy. For me, upgrading to Jaunty actually fixed the problem - I haven't had to restart Firefox since. I do notice times when the sound will "skip" momentarily, however, which might be the flash player reconnecting as described above.
There seem to be several bugs out there related to this one, including bug 254405 and 353498 (which I reported). I first noticed this problem as far back as Hardy. For me, upgrading to Jaunty actually fixed the problem - I haven't had to restart Firefox since. I do notice times when the sound will "skip" momentarily, however, which might be the flash player reconnecting as described above.