The official blurb: Share Firefox with a friend. If your friend downloads Firefox before September 15, you’ll both be immortalized in Firefox 2.
You can even choose how to link your names together on the “Firefox Friends Wall”. Examples like ‘my name’ Informed ‘your name’, or ‘my name’ Empowered ‘your name’, or ‘my name’ Liberated ‘your name’.
Perhaps MySQL can leverage this idea for some what to promote future download!