Phoenix aims to provide a “layered” approach to building a web browser. In other words, allowing mozilla.org to ship a simple stable base with core functionality, and provide a means for managing extensions and layering in add-ons, so that a user could build up the browser to be as complex as he or she wants. This allows some users to have the range of features found in today’s Mozilla releases (or even more) while also providing a convenient path for those who want a lean, quick, simple browser.