The title given to this article is incorrect due to technical limitations. The correct title is about:.
about: is used as an internal "protocol" used in various web browsers to display their built-in functions and Easter eggs. In early versions of Netscape, anything that wasn't a built-in command would display the text after the colon. In early versions of Internet Explorer, about: followed by HTML (ex. hello world) would render the string.
The most cross-browser one is probably about:blank, which shows a blank HTML document. For Opera, it will be translated into the corresponsing opera: address, if possible. But an exception is about:blank, which is not translated to opera:blank.
Shows the arguments and options used to compile the build in use
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:cache?device=memory
Shows individual entries in memory
about:cache?device=disk
Shows individual entries on disk
about:config
Shows an interface for viewing and setting a wide variety of configuration variables, many of which are not otherwise accessible through the GUI (options panels)
about:credits
Shows a list of all those who contributed to Mozilla
External links
About Protocol Links (http://kb.mozillazine.org/About_Protocol_Links) in Mozilla and Mozilla Firefox.
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