WYCIWYG is an acronym that stands for "What You Cache Is What You Get".  It is commonly displayed in the address bar of Gecko-based Web browsers like Mozilla Firefox as wyciwyg:// when the Web browser is retrieving cached information.  It is a URI scheme specific to the Mozilla family of web browsers which indicates that a link should be preferentially fetched from cache instead of from the web server.  The abbreviation is inspired by WYSIWYG but the concepts are unrelated.  Mozilla Firefox implements a unique, strictly internal wyciwyg:// pseudo-URI scheme to sort and later reference locally cached pages that were generated or modified by a script on the client side (a common practice for Web 2.0 sites).