The Firefox UserAgent you used to post this thread is Mozilla/5.0 (Windows '''NT 6.2'''; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0 The NT 6.2 is Windows 8. If you are indeed using Windows 11 then perhaps you are for some reason running Firefox in Windows 8 compatibility mode when there is no reason to. You need to uncheck the "[] Run this program is compatibility mode for" https://www.howtogeek.com/how-to-run-old-software-in-compatibility-mode-on-windows-11/ https://www.minitool.com/news/how-to-run-a-program-in-compatibility-mode.html Once you do this then you should be able to download and install Firefox 145.0.2 Release or the Firefox 140.5.0esr from https://www.firefox.com/download/all/