Firefox no longer works with some versions of Windows XP
Firefox 3.6.28 and Firefox 12 are the last versions of Firefox that will work with the original version of Windows XP and Windows XP Service Pack 1. This article explains your options.
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Option 1: Upgrade to the latest Windows XP Service Pack
To find out your Windows version and which Service Pack, if any, is installed:
Click the Windows Start button, click Run, type in winver and press the Enter key.
While the latest Firefox is supported on Windows XP Service Pack 2, Service Pack 3 is more secure. For information about Windows XP Service Pack 3, see this Microsoft support article.
Option 2: Switch to Opera
If you can't upgrade Windows XP, you can switch to the Opera web browser.