I can't listen to music using Firefox

[Alessandro]

Binary package hint: firefox-3.5

I have been accessing the following websites in order to listen to music on-line with no success.

http://jovempanfm.virgula.uol.com.br/estudio/
http://panaticos.gruporcc.com/barra/player.html#

I am using the following plugins:

Divx Web Player 1.4.0233
QuickTime Plug-in 7.2.0
Shockwave Flash 10.0 r45
VLC Multimedia Plugin (compatible Totem 2.82.2)
Windows Media Player Plugin 10 (compatible; Totem)

My Ubuntu version is 9.10.

ProblemType: Bug
Architecture: i386
Date: Sat May 1 20:15:05 2010
DistroRelease: Ubuntu 9.10
Package: firefox-3.5 3.5.9+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANGUAGE=pt_BR.UTF-8
 PATH=(custom, no user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-21.59-386
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-21-386 i686
XsessionErrors:
 (gnome-settings-daemon:1828): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:1828): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:1861): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:1883): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (firefox:1989): GLib-WARNING **: g_set_prgname() called multiple times