Without seeing the site, this is just a guess, but you are possibly using bgsound to play the music. That is Internet Explorer coding that does not work in other browsers.

For details on fixing it see http://www.w3.org/wiki/HTML/Elements/bgsound and http://kb.mozillazine.org/Background_music_does_not_play

Thanks for your reply. I don't use bg sound on my pages. I always use <EMBED src="foldername/wav name.wav" loop="TRUE" HIDDEN="TRUE"> example on my newest page: <embed src="lessons/CarrieUnderwood-LessonsLearned.wav" loop="true" hidden="true"> This always worked before I upgraded Firefox

You need to specify a MIME type attribute.
Otherwise Firefox doesn't know which plugin to use.
Using type="application/x-mplayer2" will use the Windows Media player.

<EMBED src="foldername/wav name.wav" loop="TRUE" HIDDEN="TRUE" type="application/x-mplayer2">

<embed src="lessons/CarrieUnderwood-LessonsLearned.wav" loop="true" hidden="true" type="application/x-mplayer2"> 

Wow !! That did the trick. Thank you cor-el. I'll use that on the other pages I've built. This lets me check to make sure the song is playing right. My website is http://artisanwithin.com

Is there any change this will be corrected without having to rewrite code? I only ask because I just created a large family website on CD (and directed people to use Firefox) and now none of the sounds work on the new Firefox. Any guesses why was this change made anyway? It is it more secure or something?

My music plays on my website with the new Firefox. It was only on my computer that it wouldn't play. Thanks to cor-el's suggestion I added the new code to the pages I had built and the new ones I make and it works fine. I don't know if Firefox is working to correct the problem or why it happened. This is the code I now put on my pages I build changing "musicname" to the song I want to use. <embed src="folder/music name.wav" loop="true" hidden="true" type="application/x-mplayer2">