what is firecracker ADD ONS?

When I opened the editor,
I saw the firecracker addon.
I added them to the inventory,
but I cannot add any addons to firecracker actually ingame


Is there any way I can add an add-on to firecrack?

Officially, there are no add-ons.

There were none when they were in the game for the Chinese new year ~last year. I guess it's possible some people hacked add-ons on, or that there's add-ons that were never officially released into the game - that are still in the game code, but otherwise unreachable unless you hack them on... but I wouldn't recommend trying it, if that is the case