Pentium 4 or newer processor that supports SSE2
   512MB of RAM / 2GB of RAM for the 64-bit version
   200MB of hard drive space

   Pentium 4
   512MB of RAM
   200MB of hard drive space

   Windows xp
   Windows vista
   Windows 7
   Windows 8
   Windows 10

Dear admin ∵ 1.Firefox System Requirements Firefox Recommended Hardware Pentium 4 or newer processor that supports SSE2 512MB of RAM / 2GB of RAM for the 64-bit version 200MB of hard drive space https://www.mozilla.org/en-US/firefox/87.0/system-requirements/ https://www.mozilla.org/firefox/87.0/releasenotes/ https://www.mozilla.org/en-US/firefox/browsers/ Recommended Hardware Pentium 4 512MB of RAM 200MB of hard drive space support for Windows XP and Vista ∵ 2.Portability How well does your browser work across your devices? Portability Firefox https://www.mozilla.org/media/protocol/img/logos/firefox/browser/logo.eb1324e44442.svg OS availability https://www.mozilla.org/media/img/firefox/compare/icon-check.f5e1f7b288ca.svg Firefox OS availability = yes? https://www.mozilla.org/en-US/firefox/browsers/compare/ ∴ 1."Firefox has ended support for Windows XP and Vista" is wrong!!! "https://support.mozilla.org/en-US/kb/end-support-windows-xp-and-vista" is wrong!!! https://support.mozilla.org/en-US/search?q=firefox-windows-xp-vista ∴ 2.Firefox System Requirements Firefox Windows Operating Systems (32-bit and 64-bit) Windows xp Windows vista Windows 7 Windows 8 Windows 10 Firefox must be support for Windows XP and Vista ∴ or 3.Portability How well does your browser work across your devices? Portability Firefox https://www.mozilla.org/media/protocol/img/logos/firefox/browser/logo.eb1324e44442.svg OS availability https://www.mozilla.org/media/img/firefox/compare/icon-dash.ef660bd874fc.svg Firefox OS availability = No change yes => no https://www.mozilla.org/en-US/firefox/browsers/compare/ thanks.