Text Clarity - Firefox v IE7

[None of the above]

I realise I'm probably missing something that is blatantly obvious to everyone else, but I am experiencing poor text resolution when using Firefox and can find no solution to the problem.

Text on Firefox is poorly rendered in comparison to IE7 - it isn't blurred, it simply has a somewhat 'broken' appearance.

I've tried changing the text size, screen resolution, DPI etc., but there's no improvement.

Any ideas Gentlemen, please?

Thanks,

N o t a