how do I download the support Windows 7,8,9?

https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support Firefox 116.0 and later requires Windows 10, 11 to use. To download the current Firefox 115 ESR https://www.firefox.com/download/all/desktop-esr/ > pick 64-bit or 32-bit Windows > Language > [Download ESR 115] to download the current Fx 115.36.0esr The last planned Firefox 115 ESR update will be Fx 115.39.0esr on Aug 18 unless Mozilla decides before then to extend updates yet again.