What do you mean with "each time I log onto Mozilla I have to reset Privacy" ?

The privacy settings untick each time I turn off my laptop. When I turn on my laptop and log into Mozilla browser I have to go back into Privacy in Settings and retick Logins and Passwords in order for me to Autofill passwords on regular sites I visit. I use Trend Micro Security and suspect it may be due to a setting on that or incompatibility with Mozilla as Microsoft Edge works fine??

If you have the "Trend Micro Password Manager" installed then uncheck the Password Protection box in its configuration or uninstall this application via the Windows Control Panel.