Mozilla/5.0 (Windows '''NT 6.0'''; Win64; x64; rv:109.0) Gecko/20100101 Firefox/113.0 The Firefox UserAgent you used to post this thread here appears as if you are running Firefox 113.0 on Windows Vista or Windows Server 2008 ?. Firefox 116.0 and layer including current Firefox Releases requires Windows 10, 11 to run. So your UA is modified in some way. Either it was manually modified or you are running Firefox in Windows Vista compatibility mode for some reason when there is no need to. Firefox 52.9.0esr was the last version to still support Windows XP and Vista so it is not possible to run Fx 113.0 on Vista. https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox https://support.microsoft.com/en-us/windows/make-older-apps-or-programs-compatible-with-windows-783d6dd7-b439-bdb0-0490-54eea0f45938 https://www.minitool.com/news/how-to-run-a-program-in-compatibility-mode.html