Nothing happens for me...
[05:57:27.861] uncaught exception: [Exception... "Not enough arguments" nsresult: "0x80570001 (NS_ERROR_XPC_NOT_ENOUGH_ARGS)" location: "JS frame :: http://tap5.com/lab/snowflakes.html :: <TOP_LEVEL> :: line 43" data: no]
That error just fills up the error console in firefox...