According toy your more system details on right your UserAgent appears to be Mozilla/5.0 (Windows '''NT 6.1'''; rv:109.0) Gecko/20100101 Firefox/115.0 NT 6.1 is Windows 7 Firefox 116.0 and later including the current Release requires Windows 10, 11 to run. For Firefox 7, 8, 8.1 users the most current they can run is Firefox 115 ESR currently at 115.18.0esr and will be updated til 115.21.0esr in March 2025 unless Mozilla decides in early 2025 to extend updates again. https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support