WYCIWYG: OmniScriptum WYCIWYG: Acronym and initialism, Gecko (layout engine), Web browser

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. WYCIWYG is an acronym that stands for What You Cache Is What You Get, commonly displayed in the address bar of Gecko-based Web browsers like Mozilla Firefox as wyciwyg:// when the Web browser is retrieving cached information.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. Michal Zalewski reported that it was possible to bypass the same-origin checks and read from cached documents. It is possible to access wyciwyg:// documents without proper same domain policy checks through the use of HTTP 302 redirects. This enables the attacker to steal sensitive data displayed on dynamically generated pages; perform cache poisoning; and execute own code or display own content with URL bar and SSL certificate data of the attacked page.