Oil prices firmed on Friday but were on track to end the week lower, as weaker U.S. employment data raised concerns over the health of the world’s largest oil consumer, and renewed ceasefire talks in Gaza eased worries about supply. The global oil benchmark Brent crude is trading 1.75 percent up to 78 dollars and 57 cents per barrel. The U.S. West Texas Intermediate (WTI) is also trading up 1.94 percent to 74 dollars and 43 cents per barrel, when reports last came in.