For the eol Windows 7, 8, 8.1 the most current Firefox you can run is the older Firefox 115 ESR. Firefox 116.0 and later requires Windows 10, 11 to run. Firefox 115.20.0esr is the current version and 115.21.0esr in March is the last planned update unless Mozilla decides to extend updates support again in next while. https://archive.mozilla.org/pub/firefox/releases/115.20.0esr/win64/en-US/ or you prefer another language local folders: https://archive.mozilla.org/pub/firefox/releases/115.20.0esr/win64/ In case you have 32-bit Windows 7 : https://archive.mozilla.org/pub/firefox/releases/115.20.0esr/win32/ https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support