U.S. markets opened Friday's session in the green following on the heels of gains in Europe earlier in the morning. FireEye says it has agreed to acquire Madiant for $1B in cash and stock. Chrysler reports December sales climbed 6% from December of 2012. Overall, Edmunds.com expects the auto sector to report a 5.2% increase in sales from last December. LivingSocial says it will sell roughly 2% of Groupon's shares that it received when it sold Ticket Monster to Groupon back in November. TheStreet's Ruben Ramirez reports from Wall Street.