I saw this and had to try it. When you type "about:robots" in the releases AFTER beta 4, you get this:

http://aycu17.webshots.com/image/46776/2001359410840578893_rs.jpg

There is also "about:mozilla" (it has been in Netscape/Mozilla for years, but the message changes) with a special message form The Book of Mozilla (the current one is, of course, about the revolution against IE), "about:" (credits), "about:config" (additional configuration options [careful, you can break things!]), about:plugins (installed plugins).

There were also plans to include about:kitchensink (see https://bugzilla.mozilla.org/show_bug.cgi?id=122411), but unfortunetly it
never happened.

Wasn't there a plug-in that added about:kitchensink ?? think I had it at one point :-)

> Wasn't there a plug-in that added about:kitchensink

I believe there was. You can also emulate it by adding kitchensink as a bookmark (http://www.mozilla.org/docs/web-developer/samples/kitchensink.xml) and setting its keyword to "about:kitchensink".

http://www.youtube.com/watch?v=7U6thOhg31o

After watching that video, that button rules!!!

THE BOOK OF MOZILLA!

The Book of Mozilla, 12:10
Netscape 1.1
"And the beast shall come forth surrounded by a roiling cloud of vengeance. The house of the unbelievers shall be razed and they shall be scorched to the earth. Their tags shall blink until the end of days."

The Book of Mozilla, 3:31
Netscape 6-7.1, All Mozilla until Oct. '98, and from Feb. 200
"And the beast shall be made legion. Its numbers shall be increased a thousand thousand fold. The din of a million keyboards like unto a great storm shall cover the earth, and the followers of Mammon shall tremble."

The Book of Mozilla, 7:15
Mozilla 1.5 and up, Firefox, Camino, Epiphany, Minimo, Thunerbird and SeaMonkey
"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."

The Book of Mozilla, 8:20
Netscape Navigator 9.0b1
"And thus the Creator looked upon the beast reborn and saw that it was good."

The Book of Mozilla, 11:1
Flock 1.0+
"And when the Beast had taken the quarter of the Earth under its rule, a quarter hundred Birds of Sulfur flew from the Depths. The birds crossed hundreds of mountain views and found twenty four wise men who came from the stars. And then it began, the believers dared to listen. Then, they took their pens and dared to create. Finally, they dared to share their deed with the whole of mankind. Spreading words of freedom and breaking the chains, the birds brought deliverance to everyone."

The Book of Mozilla, 11:9
Firefox 3+
"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."
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The Meanings for all these verses can be found here http://en.wikipedia.org/wiki/Book_of_mozilla

NOTE: "The Unbelievers=IE users, "The Mamon"=Netscape and "The beast reborn"=Firefox

Its fun to try and work these out without reading the article though

WAit! the mammon is actually also IE, and The Beast is Netscape

   about:about

This has a list, but it might just be a sorted mru list.
Trying something like "about:example",
for any "example" seems to add it to the list.

There is a wiki concerning the "about" uri scheme.
   http://en.wikipedia.org/wiki/About:_URI_scheme

see also:
   http://kb.mozillazine.org/Firefox_:_FAQs_:_About:config_Entries

In Flock 1.1:

nd 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

Currently it is planned to land Flock 1.2 in some weeks

hebbet

That's the verse thats in Most of the Mozilla browsers right now too.

You are right.