Why don the default Firefox fonts in Solaris look as crisp as the Windows Firefox fonts?
At the present time, don’t use the default serif or sans-serif fonts in Firefox. For “western” locale, Solaris has already substituted them with “Times” and “Helvetica”, respectively. If you use other locales, make sure that you do similar adjustments. Also, if you’re using GNOME, go into the Desktop Preferences menu, bring up the Font preferences dialog, and try the different options there to better tune the font rendering to your display. The differences can be very noticeable.