Gold prices fell on Friday, as the dollar firmed on uncertainty over further Federal Reserve rate cuts, although bullion was still on track for its third straight monthly gain. Spot gold was down 0.5% at $4,004 per ounce, as of 0240 GMT. Bullion has gained 3.9% so far this month. US gold futures for December delivery were steady at $4,016.70 per ounce.