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 run. Firefox 115 ESR is the latest version you can run on the EOL Windows 7 (also 8, 8.1). The most current version of Firefox you can run s Fx 115.14.0esr and the last update will be 115.15.0esr next Tuesday September 3rd unless Mozilla decides to extend updates support. https://www.mozilla.org/firefox/all/desktop-esr/