Keeping your cat inside
During fireworks season, you'll need to ensure your cat is safe and sound. Keep them in after dark, and provide them with a litter tray, food and water bowls and a place to hide. You'll need to make sure all cat flaps, doors and windows are closed to ensure your cat doesn't escape.
Other ways to keep your cat calm
You might find that playing soothing music helps your cat, as does keeping the curtains drawn. This will reduce awareness of any flashes that might spook your cat. Alternatively, try using a pheromone plug-in diffuser - it can be used to reduce anxiety and create a calming effect. Start using it a couple of weeks before fireworks season starts and site it in the room where your cat spends most of their time.
The important thing to remember is not to reinforce fearful behaviour by overly comforting a cat that looks anxious. Keep calm yourself and ensure your cat has a safe space.