I have no audio in Firefox, but do have it in IE.
I have installed the latest version of Flash and have no missing plug ins. I can hear everything in IE (you tube videos, etc.) but nothing in Firefox.
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See What to do if Firefox won't play any sounds and Fix common audio and video issues
You can also try to llear the Flash cookies and settings.
Flash Website Storage Settings panel:
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html
See also Flash Local storage settings
http://www.macromedia.com/support/documentation/en/flashplayer/help/help02.html
Your above posted system details show outdated plugin(s) with known security and stability risks.
- Next Generation Java Plug-in 1.6.0_18 for Mozilla browsers
Update the Java plugin to the latest version.
- http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)