NEW YORK — Hundreds of thousands of Fox News viewers are reacting to Tucker Carlson’s firing by abandoning the network in his old time slot — at least temporarily. Fox drew 1.33 million viewers for substitute host Brian Kilmeade in the 8 p.m. Eastern hour on Wednesday night, putting the network second to MSNBC’s Chris Hayes in a competition Carlson used to dominate, the Nielsen company said. That’s down 56% from the 3.05 million viewers Carlson reached last Wednesday, Nielsen said.