Like Windows' Internet Explorer, Firefox has some interesting Easter Eggs (hidden messages) in its innards. To see them, just type in the words in your address bar and click return (or enter). Thanks TechPwn for this post.
About:Mozilla - This one is a bit odd. It displays a quote as if it was out of the some holy book. This is Mozilla getting back at Microsoft because if you put this in IE, it gives you a blue screen, making fun of a Mozilla crash. Here is what it says…
And so at last the beast fell and the unbelievers rejoiced. But all was not lost, for from the ash rose a great bird. The bird gazed down upon the unbelievers and cast fire and thunder upon them. For the beast had been reborn with its strength renewed, and the followers of Mammon cowered in horror.
from The Book of Mozilla, 7:15
About:config - This page shows you all of Firefox’s configuration. You can set settings to your own liking. There are many pages out there that talk about speeding up Firefox by editing some settings in here. Just Google “speed up firefox”.
About:cache - Ever wondered how much space the Firefox cache is taking up? This page will let you know.
about:plugins - This gives you a detailed list of plugins installed on your machine. This could come in handy if certain pages (especially media files) aren’t loading correctly.
About:credit - This one is self explanatory. It will show you all of the people who have spent their time building this great piece of software.
about:blank - This one might not be too hidden, but if you’d like to set your browser homepage to a blank slate, this could come in handy.