playing ogg files (flac codecs) in browser’s native player

hi,
I have a problem and didn’t find much info on it, maybe you can help, hopefully.
I created a very simple web page that uses HTML5’s audio tag and I want it to play ogg file with flac codec.
I have several ogg files but the browser don’t want to play any of them.
My question is does FireFox support this combo of ogg file with flac codec ?
Do I need to add attribute to the tag himself?
Where can I find more info on this subject?
Thanks,
Shirly

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