It depends. Poser 5's Material Room has a lot of functions that D|S currently lacks, and asking for Firefly certainly suggests that at least some material room settings are being used. However, D|S (when rendering with 3Delight) does support some features of the Poser 5 material Room (displacment, reflection, refraction, maps to control the strength of features such as specularity) so it might be possible to hook things up to work (but you'd have to do it by hand, or find someone who'd already done it and was willing to share their presets).