Mozilla Firefox 4 is the latest version of the Firefox web browser, released on March 22, 2011. The first beta was made available on July 6, 2010; Release Candidate 2 (base for the final version) was released on March 18, 2011. It was codenamed Tumucumaque, and has been confirmed as 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.
Mozilla Firefox 4 includes many new features since version 3.6.
User interfaceFirefox 4 brings 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 include improved "doorhanger" notifications, Firefox Panorama (a feature that lets the user organize tabs into windows called "groups" and perform various operations on groups), application tabs, a redesigned extension manager, Jetpack extensions support, integration with Firefox Sync, and support for multitouch displays.
Many changes were made to the user interface. By default, tabs are now on the top of the window. The "stop" "reload" and "go" buttons have been combined into a single button, placed on the right side of the address bar. The button changes dynamically based upon the current state of the page. On Windows Vista and Windows 7, the menu bar is hidden by default with the most common actions moved to a new "Firefox" menu in the upper left hand corner of the browser. Users can create persistent "app tabs", and customize the tab bar, as well as the bookmark and navigation bars.
EngineFirefox 4 is based on the Gecko 2.0 engine, which adds and improves support for HTML5, CSS3, WebM, and WebGL. Also, it includes a new JavaScript engine (JägerMonkey) and better XPCOM APIs.
JägerMonkey is a new JavaScript engine designed to work alongside the TraceMonkey engine introduced with Firefox 3.5. It improves performance by compiling "non-traceable" JavaScript into machine language for faster execution.
Firefox 4 is the first version of Firefox to drop native support of the Gopher protocol; however, continued support is available through an add-on.
Firefox 4 introduces an audio API, which provides a way to programmatically access or create audio data associated with a HTML5 audio element. It allows, for example, to visualize raw sound data, to use filters or to show the audio spectrum.
Firefox 4 no longer relies on the underlying OS for text layout/shaping. Instead, it uses HarfBuzz. This allows for smart OpenType layout/shaping which is consistent across different operating systems.
PerformanceFirefox 4 has marked a major change in performance in comparison to former versions 3.6 and 3.5. The browser has made significant progress in Sunspider JavaScript tests as well as improvements in supporting HTML5.
Since Firefox 4.0 Beta 5, hardware acceleration of content is enabled by default on Windows Vista and Windows 7 machines using Direct2D, on OS X using Quartz (basically CPU-only), and Linux using XRender. Hardware acceleration of compositing is enabled by default on XP, Vista and 7 machines using Direct3D, OS X and Linux using OpenGL.[31] Using hardware acceleration allows the browser to tap into the computer's graphics processing unit, lifting the burden from the CPU and speeding up the display of web pages.
PrivacyFirefox 4 contains support for the "do not track" header, an emerging standard for Web privacy. The header signals the user's request to the web service that any web visitor tracking service be disabled. In the future, this privacy request may become a legal requirement.
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