Can't change volume in HTML5 Audio tag in FireFox

On this page http://www.metrovancouver.org/services/solidwaste/Holiday/Pages/Song.aspx

I'm using a regular <audio> tag so users can listen to the song. I have a flash fallback on it too for users of IE.

In Chrome it works OK.

In FireFox 3.6.12, however, I cannot adjust the volume. If I put my mouse over the volume button, the volume slider appears, but as soon as I move my mouse to the slider to adjust, it disappears. I can mute the vo开发者_如何学Clume and unmute, but can't manually adjust the slider. Is anyone else having this problem?

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It doesn't look like you are the only one. This bug has been reported in bugzilla and is being looked into it seems.