Whats Gecko?
Gecko is the code name that we use to describe the rendering engine that we’re using in Firefox 2 and Firefox 3. It’s the rendering engine that was created to replace the original engine used in the Netscape 4.x browsers. In the Netscape 4 days the rendering engine just rendered the HTML that was downloaded, but in browsers released under the Mozilla name after Netscape 4, Gecko is responsible for rendering HTML pages and the rest of the UI. Gecko will continue to evolve over time with the Mozilla2 work that is currently underway.