Thanks to my Gadgets and Gizmos Pageflakes page by Jenny Zuko I have discovered that Firefox has a virtual Easter egg (Wikipedia definition for those who are curious). It was discovered by one of the geeks at Geek24.com.
Just go into the address bar and type ‘about:mozilla’.
Here is an indication of what you will see, but unless your eyesight is a lot better than mine you will need to view the page.