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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. They won't be updated with security and stability fixes. In order to keep your computer and personal information safe, we recommend that you upgrade for free to Windows XP Service Pack 3 and install the latest Firefox. This article goes over your upgrade options.

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. They won't be updated with security and stability fixes. To keep your computer and personal information safe, we recommend that you upgrade for free to Windows XP Service Pack 3 and install the latest Firefox. This article goes over your upgrade options. {for mac,linux} {note}'''Note:''' This article only applies to Windows.{/note} {/for} {for win,fx35} {warning}'''Warning:''' Firefox 3.6 is [http://en.wikipedia.org/wiki/Vulnerability_%28computing%29 no longer secure]. To keep your computer and personal information safe, please follow the recommendations below.{/warning} {/for} __TOC__ =Option 1: Upgrade for free to Windows XP Service Pack 3= For older versions of Windows XP, Service Pack 3 is a free upgrade from Microsoft. Installing this upgrade is the most secure option and will allow you to run the latest and greatest Firefox. #[http://support.microsoft.com/kb/322389 Learn more at Microsoft's website]. #[[Updating Firefox|Update Firefox]] =Option 2: Switch to Opera= If you can't upgrade Windows, you can switch to the latest version of the Opera web browser. *[http://www.opera.com Lean more at Opera's website]. {warning}'''Warning:''' Continuing to use the original version of Windows XP, Windows XP Service Pack 1 or Service Pack 2 is no longer supported by Microsoft and poses a significant security risk.{/warning}