I change my repo manager to LA, California, as suggested and was able to get the new FF version 76 as well as the new youtube-dl which fixed MPS-YouTube problem.
I now have tunes!
Thank you for pointing me in the right direction.
Dell Latitude D610 laptop with antiX 19.3 (32 bit)
Dell Latitude D620 laptop with antiX 19.3 (64 bit)