'''http://www.mozilla.org/en-US/firefox/all/'''

Note that your Windows XP platform is no longer supported and you already have the last Firefox 52.9.0 for this platform. Current Firefox releases require Windows 7 and newer, so you need to update your OS or possibly look for a suitable Linux distribution for your device. 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