how to download updated Firefox?

Based on your system details your UserAgent used to post this thread is Mozilla/5.0 (Windows '''NT 6.1'''; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0 NT 6.1 is Windows 7 The most current Firefox that supports Windows 7, 8, 8.1 is Firefox 115 ESR currently at 115.18.0esr and will be supported till at least 115.21.0esr in March 2025 unless Mozilla decides to extend updates again. https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support Firefox 116.0 and later including current Release requires Windows 10, 11 to run.