 If you insist on setting off your own pyrotechnics this week, there are plenty of regulations in Delaware that govern the use of fireworks by amateurs. The Delaware State Fire Marshal's office says only on July 4th and a few other days during the year is it permitted to light certain fireworks such as sparklers, what are known as spinners, fountains, jumping jacks, and ground blooms. Fireworks that are launched and explode in the air? Prohibited.