Firefox 3 anti-aliasing glitch

This is what text looks like in Firefox 3 Mac with any value of the CSS opacity property set on it. It only crops up when you're using any of the system-wide anti-aliasing settings optimized for LCDs, which use sub-pixel anti-aliasing. I suspect it's a conflict between the anti-aliasing applied by the Cairo graphics engine and the system, but it's definitely a bug and it's definitely annoying.

I'll buy a pizza for the first person who finds a way to turn off sub-pixel AA in Firefox 3, like Shaun's text-shadow trick for Safari.