U.S. stock indexes opened lower on Friday after the November jobs report shows a sign of continued strength in the labor market, raising concerns that the Federal Reserve's policy will remain tighter for longer. The U.S. created a robust 263,000 new jobs in November, a historically strong pace of hiring that threatens to prolong a bout of high U.S. inflation. The unemployment rate held at 3.7%, while the average hourly earnings rose twice as much as forecast. The S&P 500 lost 1%, while the Dow J