According to people who have contributed to my Funai disc tracking thread
, the Magnavox NB500MG9 can play:
Firefly, X-Files, X-Files 2.
This player is also known as the Insignia NS-BRDVD (which is the Funai-made model previous to the newer yet reportedly problematic Desay-made 2NS-BRDVD), and also known as both the Sylvania NB500SL9 and NB501SL9. The reports came from people specifically who own the Magnavox version though.