It’s hardly any Easter eggs in Firefox, as the whole software is open source where everybody can see the source code. So it’s hardly surprising or refreshing if there is any Easter eggs in Firefox as it would have been known easily by everybody who knows how to read the programming language code. Even so, there are indeed some Easter eggs in Firefox.

To see the first easter egg in Firefox, type about:Mozilla into the Address Location Bar.

You will see the some text in dark red background. For example:

Mammon slept. And the beast reborn spread over the earth and its numbers grew legion. And they proclaimed the times and sacrificed crops unto the fire, with the cunning of foxes. And they built a new world in their own image as promised by the sacred words, and spoke of the beast with their children. Mammon awoke, and lo! it was naught but a follower.

from The Book of Mozilla, 11:9
(10th Edition)

The Beast adopted new raiment and studied the ways of Time and Space and Light and the Flow of energy through the Universe. From its studies, the Beast fashioned new structures from oxidised metal and proclaimed their glories. And the Beast’s followers rejoiced, finding renewed purpose in these teachings.

from The Book of Mozilla, 11:14

Not surprising? Well, the similar Easter egg exists in all versions of Firefox since Firefox 2, so it’s guessable. How about trying to type about:robots into the Firefox Location Bar? This Easter egg is lesser known and will get you the following ‘theory’:

Welcome Humans!

We have come to visit you in peace and with goodwill!

  • Robots may not injure a human being or, through inaction, allow a human being to come to harm.
  • Robots have seen things you people wouldn’t believe.
  • Robots are Your Plastic Pal Who’s Fun To Be With.
  • Robots have shiny metal posteriors which should not be bitten.

And they have a plan.

Firefox about:robots Easter Egg

There is a button saying Try Again. Don’t be fool to click the button just to see Please do not press this button again.