Mozilla Firefox 4 is a version of the Firefox web browser, released on March 22, 2011. The first beta was made available on July 6, 2010; Release Candidate 2 (a base for the final version) was released on March 18, 2011. It was codenamed Tumucumaque, and was Firefox's last large release cycle. The Mozilla team planned smaller and quicker releases following other browser vendors. The primary goals for this version included improvements in performance, standards support, and user interface. There was one security update in April 2011 (4.0.1) and version 4 of the browser was made obsolete by the release of Firefox 5 in June 2011. This marked a transition to giving much less weight to major version numbers, with 5 more major version numbers used by December of that year (5, 6, 7, 8, and 9), compared to 4 in nearly a decade of Firefox development (1, 2, 3, 4). History On October 13, 2006, Brendan Eich, Mozilla's Chief Technology Officer, wrote about the plans for "Mozilla 2", referring to the most comprehensive iteration since its creation of the overall platform on which Firefox and other Mozilla products run. Most of these objectives were incorporated into versions 3.0, 3.5, and 3.6. The largest changes, however, were deferred to Firefox 4.0. In early May 2010, Mozilla's plans for Firefox 4.0 were officially detailed through a blog post by Mike Beltzner, Firefox director. On May 25, 2011, the Firefox release manager wrote in an email "Firefox 5 will be the security update for Firefox 4," confirming Firefox 4 had entered its "end of life" phase where Mozilla will no longer issue updates. Mozilla continued to issue updates for Firefox 3.6 after 4's EOL declaration. Only one update (4.0.1) was issued for Firefox 4 during its lifetime. Many looking for a copy of this version 4 will be directed to version 6, which cannot run on PowerPC Macintoshes. Features Mozilla Firefox 4 includes many new features since version 3.6. User interface Firefox 4 brought a new user interface, with a new look designed to make it faster. Early mockups of the new interface on Windows, Mac OS X, and Linux were first made available in July 2009. New features included improved "doorhanger" notifications, Firefox Panorama (a feature that lets the user visually group tabs), application tabs, a redesigned extension manager, Jetpack extensions support, integration with Firefox Sync, and support for multitouch displays.