I have Firefox 132.0.1 (64-bit).
I found out Advanced System Care 18 (Maybe Driver Booster 12. I do not have malware fighter installed.) was preventing me from changing AppData folder Mozilla Firefox preferences files. I was not even allowed to manually delete these files after uninstalling Firefox. Closing down Advance System Care and Driver booster released holds on these files. Removing all Mozilla Firefox files in Local folder and roaming folder allowed me to reinstall Firefox and now Firefox behaves properly and allows changes in settings.
