I was going through Cliff Wootton‘s JavaScript Reference, the wonderful 2625 pages of JavaScript reference published by Wrox and, and at the A index page I see a reference to about:; I considered it odd, as I have used the book as reference for a long time now, but never noticed such a trivial subject.

Reading about it being treated so seriously got me a little curious. I mean, most people know about about:blank, you know, the empty document, or about the Book of Mozilla (only works on Mozilla/Gecko based browsers), or even the complex and very useful Mozilla’ish about:config settings window, but did you know about these SeaMonkey/Firefox ones:

• about:cache – Disk and Memory cache information
• about: – in page version of the about dialog
• about:plugins – lists all the installed plugins (very useful)
• about:buildconfig – details about the SeaMonkey/Firefox build
• about:neterror – this is my absolute favorite, it displays an error

Mostly i use about:config and about:cache but the random about:neterror coworker prank is always high-rated in my office .

Read more about about:
http://en.wikipedia.org/wiki/About:_URI_scheme
http://kb.mozillazine.org/About_protocol_links