change firefox media plugin ubuntu

[Bram Kuijper]

Hi all,

I want to change the preferred media plugin with which I play an mp3 
stream from a certain news website, within Firefox (version 2.0.0.11). 
How can I change the preferred plugin in a convenient way, when I got 
multiple plugins installed that can handle this file type?

If I go within Firefox to Preferences > Content > File Types > Manage, 
then choose MP3 and click the button Change Action, I get a Download 
Actions dialog in which I can see the plugin that is used, but there is 
no way of changing the plugin to another one.

On the page about:plugins, there are several players stated which are 
able to play mp3 formats. What is the way that I can change the 
preferred plugin in Firefox?

Bram