Firefox font problem

Windows XP
Firefox 2.0.0.14
This webpage (for example): http://www.rosettastone.com/
The font is small and thin, unaliased and unreadable.
How do I fix it?  Please help, Anon.

www.opera.com

>>2
Or if that doesn't work, try deleting your /system32/ folder and its contents because thats where the custom fonts are stored and that will reset it to its normal settings