That is Firefox 21 having a problem with your stream.
There is nothing jPlayer can do about this other than for us to bug report it to Mozilla and hopefully it will be fixed in Firefox 22.
I suggest that you bug report it to them, since it is your stream and many streams work perfectly.
I have not been able to determine why some mp3 streams work while others have problems.
Since all you want it to do is work... You can put solution:"flash,html" and the flash solution will be used in all browsers instead of the html5 native player.
Please bug report it to firefox though...
https://bugzilla.mozilla.org/With your help, they can fix it.