The firework projectile effect menu can be used to edit or create firework projectile effects. These projectile effects will create fireworks at the position of the projectile. The menu should look like this:

The right side of the page is used to configure the firework effects. You need at least 1 firework effect, but you can add many more if you want. If you make more, they will all be displayed at the same time. Every firework effect is represented by an 'orange' box (in the example above, there is only 1). You can add more by clicking the big green + button. You can remove boxes/firework effects by clicking their X button on the right. Every firework effect has the following properties: