This is not an application specific issue, but can be resolved via your Windows XP options with the below steps.

Please visit this site for steps to resolve:
http://www.blabla.co.za/firefox-and-chrome-screen-font-rendering/

Right-click on a blank area of your Desktop and select Properties from the pop-out menu. In the Display Properties dialogue, switch to the Appearance tab, and click on the Effects button near the bottom left. Ensure the tick mark alongside Use the following method to smooth the edges of screen fonts: is on, and then select ClearType from the drop-down options. A quick OK and Apply to apply the changes, reload your browser page, and you’re all done.