Hi That is because you are on the Windows XP platform. Current Firefox releases require Windows 7 and newer, so you would have to update your current Windows version.. Users on Windows XP and Vista have been moved to the Firefox 52 ESR version. *https://support.mozilla.org/en-US/kb/end-support-windows-xp-and-vista *https://support.mozilla.org/en-US/kb/your-hardware-no-longer-supported