This article may be too technical for most readers to understand. Early mockups of the new interface on Windows, Mac OS X, and Linux were first made available in July 2009. User interface įirefox 4 brought a new user interface, with a new look designed to make it faster. Mozilla Firefox 4 includes many new features since version 3.6. Many looking for a copy of this version 4 will be directed to version 6, which cannot run on PowerPC Macintoshes. Only one update (4.0.1) was issued for Firefox 4 during its lifetime. Mozilla continued to issue updates for Firefox 3.6 after 4's EOL declaration. 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. In early May 2010, Mozilla's plans for Firefox 4.0 were officially detailed through a blog post by Mike Beltzner, Firefox director. The largest changes, however, were deferred to Firefox 4.0. Most of these objectives were incorporated into versions 3.0, 3.5, and 3.6. 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.

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