Kimberly Vaughan Firearm Safe Storage Act This bill directs the Department of Justice (DOJ) to establish voluntary best practices for safe firearm storage solely for the purpose of public education. DOJ must give at least 90 days public notice and afford an opportunity for a hearing before establishing such best practices. The bill authorizes DOJ to award grants for the development, implementation, and evaluation of Safe Firearm Storage Assistance Programs. The bill also provides for a new tax credit through 2030 for 10% of amounts received from the retail sale of a safe firearm storage device for use in the United States.