Jason Mattis, 51, was found guilty Thursday of throwing a firebomb at a home in the Tacony neighborhood of Northeast Philadelphia during the summer of 2022, federal prosecutors said. Mattis was accused of throwing the homemade devices at multiple properties on two separate nights. He was found guilty of possession of an unregistered destructive device. Mattis faces a maximum possible sentence of 10 years in prison, three years of probation and a $250,000 fine.