I am running Windows 11 Pro and Firefox 147. Beginning the second week of Feb, Chase bank will not allow me to log into their system. They tell me I have to update to firefox 128. I am running 147. What else can I do?

Your user agent is

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0 Herring/99.1.3450.51

That last part is suspicious and it could break Chase bank website.

See https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox#w_reset-the-default-firefox-user-agent

Steven, have you been able to resolve the issue? The block seems to be based on some of your "privacy" addons — aren't you by any chance using something like CCleaner's Kamo, or other "anti–fingerprinting" solution, coming either from your antivirus or malware/security software?