Suffusion Dark theme broken on Firefox

I’m using the latest Suffusion and am using the preset royal blue on dark theme. One of my readers commented that the theme changed when he was visiting my blog on a different computer. I asked a few other people and narrowed it down to a FireFox issue. Blog URL is http://clylla.com

Theme looks like this in Chrome and IE: http://dl.dropbox.com/u/18525080/BlogTheme.png

Theme looks like this in FireFox: http://dl.dropbox.com/u/18525080/BlogThemeFireFox.png

I’m guessing there’s an issue with the CSS compatibility? I haven’t actually modified any of that stuff at all, just using the preset through the Suffusion options tool.