Paper/nms-patches/EntityFireworks.patch

--- a/net/minecraft/server/EntityFireworks.java
+++ b/net/minecraft/server/EntityFireworks.java
@@ -117,8 +117,12 @@
         }
 
         if (!this.world.isClientSide && this.ticksFlown > this.expectedLifespan) {
-            this.world.broadcastEntityEffect(this, (byte) 17);
-            this.k();
+            // CraftBukkit start
+            if (!org.bukkit.craftbukkit.event.CraftEventFactory.callFireworkExplodeEvent(this).isCancelled()) {
+                this.world.broadcastEntityEffect(this, (byte) 17);
+                this.k();
+            }
+            // CraftBukkit end
             this.die();
         }