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?

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