You're welcome.🙏

Aaw, your poor cat. These sounds are putting you both through hell. I wish we lived in a far more considerate world, I really do. It's the Soccer World Cup happening at the moment too, so maybe the firecrackers will at least reduce after the soccer has finished.

These foam earplugs are cheap and I'm sure are available everywhere. The hardware store should stock them. And good on you for trying all sorts of things as well. Hopefully these will be comfortable in your ears , they're very light and soft. Non-intrusuve as you can see in the picture Biba_yu.