Not every photo you take at the fireworks display will be perfect. The burst will be too small, the burst will be a bit to the left, the other too far to the right, etc.
Let Layers in Photoshop come to the rescue.
This only works, by the way, if you don’t move your tripod during the display.
Highlight each image that you want to blend in Photoshop Bridge. Clicked on Tools >Photoshop> Load Files Into Photoshop Layers. Photoshop opens the images in a layer stack on the right side. (Lightroom users will highlight all the images, click Edit>Photo>Load Files Into Photoshop Layers.)
Highlight each image, then clicked on Lighten in the blend mode. Then click Layer>Flatten. Click on Filter>Camera Raw Filter to open the image in Adobe Camera Raw so you can tweek it a bit.