Vapor barrier basement ceiling edge?

i replaced my insulation there with spray foam. closed cell.

more $$ but easier to vapor seal that way. the old insulation that was in there was borderline moldy if I remember right.

visqueen below grade? generally, that is not a good idea, and can be very bad. i would not use poly, unless code mandated or you are in a very cold spot. i think i'd either ditch the fg insulation and replace it w/ rigid foam, caulking or spray foaming around the edges, or put thinner rigid foam right over the fb and seal it as above. fg batts are generally pretty crappy insulation, but you did an excellent job installing them, which helps.