Loquax Fireworks is an old school applet that lets you 'ooh' and 'ahh' to your heart's content at a virtual firework display. The applet was developed around 1999 as a bit of fun - and it's not been tweaked since. That said it still works and will give you a display of bright coloured lines without having to go out in the cold.
To control your fireworks adjust the sliders. From the top the controls are:
Speed (how fast the fireworks go)
Radius (how wide they spread)
Density (control your density!)
Gravity (how quickly do they fall)
Energy (how much oomph do you want?)
In some browsers the labels on the sliders don't show up. Sorry we've no idea why!