Mozilla Firefox Easter Eggs (Works!)
Here is a collected list of easter eggs present in Firefox. Check them out!
Type exactly as they are. New line means a new egg 
Some of these are settings for Firefox. IT IS NOT RECOMMENDED THAT YOU CHANGE THEM.
– Easter Eggs –
about:
about:config
about:cache
about:buildconfig
about:credits
about:mozilla
There is also
about:?
Antonio Misericordia
March 6, 2006 at 5:16 pm
Yeah!
Sukhbir
March 6, 2006 at 5:30 pm
try about:robots
aafasf
July 26, 2009 at 11:36 am