Install Firefox 115 ESR for continued support and security patches on Windows 7. https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr

Your useragent in system details shows you are using Firefox 114.0.2 and not 115 though. You should be getting the update mar to 115 ESR and not the 115 Release. You can download the 115.0.3 ESR from https://www.mozilla.org/firefox/all/#product-desktop-esr though make sure the "Which version would you like?" drop menu has 115 ESR selected as the older 102 ESR is selected by default. ESR (Extended Support Release) is meant more for Enterprise users in mind however by using Firefox 115 ESR you should get security/stability updates until 115.15.0 ESR release late next year. It is Firefox 116 and later that has dropped support for the old EOL Windows 7, 8, 8.1 https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support Meanwhile Chrome, Chromium, Opera, Edge dropped support for Windows 7, 8, 8.1 back in January/February this year. Besides using Windows 10/11, you could try dual booting with a light Linux distsro using a desktop like Xfce in order to use more current Firefox versions as time goes on.