Hidden pages in Mozilla Firefox

How many of us knows that Mozilla Firefox have numerous hidden pages inbuilt?Maybe the most famous page among this group is "about:blank" page.It simply shows a blank page.There are numerous other "about:" pages which are interesting and useful inbuilt tools.Technically these are internal URI handlers.

To try the below, just enter address and hit enter.
Note: Some may not work in older versions.

Address	Output
about:	Shows version information and copyright information.
about:blank	Shows a blank HTML page.
about:plugins	Shows the filename,MIME type, description, suffix, and status of all installed plug-ins
about:cache	Shows information about the Cache Service.Number of entries, location of cache, size of cache, etc. for both memory and disk cache.
about:mozilla	Shows a page from the fictional Book of Mozilla.It is really interesting!It is an Easter Egg (intentional hidden message).
about:bloat	Displays BloatView output (disabled in release builds).
about:blocked	Shows the malware protection page used when the browser identifies a page as not safe for viewing. (Firefox 3-specific).
about:buildconfig	Shows the arguments and options used to compile the build in use.
about:cache?device=memory	Shows individual entries in memory
about:cache?device=disk	Shows individual entries on disk
about:cache?device=offline	Shows individual entries for offline viewing.
about:cache-entry	Shows information about a cache entry. Used in about:cache links. Requires parameters.
about:config	Shows an interface for viewing and setting a wide variety of configuration variables.Power users can tweak Firefox here.But be careful!
about:crashes	Shows details of crashes submitted by Mozilla's crash reporter (since Firefox 3).
about:credits	Shows a list of all those who contributed to Mozilla
about:licence	In the British English localized version, shows the content of about:license but with all occurrences of license used as a noun replaced with licence.
about:license	Shows the license(s) of Mozilla Firefox.
about:logo	Shows the logo used on the about: screen
about:neterror	Shows the error page used when the browser could not access the requested path.
about:robots	Again an  Easter egg, beginning with March 8th, 2008 trunk builds.
about:rights	Shows licensing information.

All browsers have their own about: schemes.Checkout this Wikipedia article for a complete comparison of all browsers.
http://en.wikipedia.org/wiki/About:_URI_scheme


Some screenshots:

about:mozilla

about:robots

about:

about:config