From an article in the Cleveland Plain Dealer:
"[Jackson] was the sixth straight Browns coach to be fired after a loss to the Steelers in the second meeting of that season. The others were Romeo Crennel, Eric Mangini, Pat Shurmur, Rob Chudzinski and Mike Pettine. The last four of those were fired by the Haslams since they agreed to purchase the Browns in 2012. According to a source, Jackson was told by ownership that the team had quit on him and that he wasn't doing a good job of leading. They told him that his offense and defense had regressed."
"[Jackson] was the sixth straight Browns coach to be fired after a loss to the Steelers in the second meeting of that season. The others were Romeo Crennel, Eric Mangini, Pat Shurmur, Rob Chudzinski and Mike Pettine. The last four of those were fired by the Haslams since they agreed to purchase the Browns in 2012. According to a source, Jackson was told by ownership that the team had quit on him and that he wasn't doing a good job of leading. They told him that his offense and defense had regressed."