Netscape Navigator 9's features were said to include newsfeed support and become more integrated with the Propeller Internet portal, alongside more enhanced methods of discussion, submission and voting on web pages. It also sees the browser return to multi-platform support across Windows, Linux and Mac OS X. Like Netscape version 8.x, the new release was based upon the popular Mozilla Firefox (version 2.0), and supposedly had full support of all Firefox add-ons and plugins, some of which Netscape was already providing. Also for the first time since 2004, the browser was produced in-house with its own programming staff. A beta of the program was first released on June 5, 2007. The final version was released on October 15, 2007.