https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/241449 System: [Hardware] 00:00.0 Host bridge: ATI Technologies Inc Unknown device 7930 Fix for Firefox Sound problems on Ubuntu December 19th, 2005 Posted in General http://antonolsen.com/2005/12/19/fix-for-firefox-sound-problems-on-ubuntu/ If you're using Ubuntu and gnome, then odds are that esd is starting and taking control of the soundcard. If you have any apps talking to esd (like your mp3 player) then Firefox won't be able to talk like it usually does to /dev/dsp. To solve this, we just need to tell Firefox to use esd and it can share the audio nicely with other apps. If you're using BASH this should launch firefox with esd support. #export FIREFOX_DSP=esd #firefox You can also put this near the top of /usr/bin/firefox like this: #!/bin/sh FIREFOX_DSP=esd # # ***** BEGIN LICENSE BLOCK ***** # Version: MPL 1.1/GPL 2.0/LGPL 2.1 [...] And another, and perhaps the best, way to do this is t...