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Firefox 4.0
26-03-2011 02:25

Firefox 4 Free Download

Firefox 4 Release Notes

v.4.0, released March 22nd, 2011 Check out what’s new, the known
issues and frequently asked questions about the latest version of Firefox. As
always, you’re encouraged to
tell us what you think,
or file a bug in Bugzilla.

What’s New in Firefox*4

Firefox*4 is based on the Gecko 2.0 Web platform. This release
features JavaScript execution speeds up to six times faster
than the previous version, new capabilities for Web Developers and
Add-on Developers such as hardware accelerated graphics and HTML5
technologies, and a completely revised user interface. Please read
below for more detailed information about what's new in this version
of the release, as well as the known issues.

  • Firefox*4 is available in over
    80 languages

  • Uses

    , a new, faster JavaScript engine that is up to six
    times faster than Firefox 3.6

  • Support for the

    Do Not Track ("DNT") header
    that allows users to opt-out of
    behavioural advertising

  • Firefox Sync
    is included by default, allowing you to securely synchronize between
    multiple computers and mobile devices

  • Certain graphics rendering operations are now

    using Direct3D 9 on Windows XP, Direct3D 10
    on Windows Vista and 7, and OpenGL on Mac OS (OpenGL on Linux will
    be supported in the future)

  • Direct2D Hardware Acceleration
    is now on by default for Windows
    7 users

  • WebGL is enabled on all platforms that have a capable graphics
    card with updated drivers

  • Native support for the HD HTML5

    video format, hardware accelerated where available

  • Firefox button has a new look for Windows Vista and Windows 7

  • Tabs are now on top
    by default on Windows, Mac OS X, and Linux

  • You can

    search for and switch to already open tabs
    in the Smart Location

  • The stop and reload buttons have been merged into a single
    button on Windows, Mac OS X, and Linux

  • The Bookmarks Toolbar has been replaced with a Bookmarks Button
    by default (you can switch it back if you'd like)

  • Crash protection for Windows, Linux, and Mac OS X when there is
    a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight

  • You can turn any tab into an "App Tab" by right-clicking on it
    and selecting "Make into App Tab" from the context menu

  • The default homepage design has been


  • Overhaul of the
    bookmarks and history code
    , enabling faster bookmarking and
    startup performance

  • Per-compartment garbage collection
    is now enabled, reducing work
    done during complex animations

  • Additional polish for the Firefox Add-ons Manager

  • Improved web typography using

    with support for ligatures, kerning and font variants

  • Web developers can animate content using

  • Responsiveness and scrolling improvements from the new

    retained layers
    layout system

  • HTML5 Forms API
    makes web based forms easier to implement and

  • Support for the new proposed
    Audio Data API

  • Support for

    HSTS security protocol
    allowing sites to insist that they only
    be loaded over SSL

  • A
    new feature called Panorama
    gives users a visual overview of all
    open tabs, allowing them to be sorted and grouped

  • An

    experimental API
    is included to provide more efficient
    Javascript animations

  • Firefox now supports the

    HTML5 video "buffered" property

  • Changes to how XPCOM components are registered
    in order to help
    startup time and process separation

  • New Addons Manager and extension management API (UI will be
    changed before final release)

  • Significant API improvements are available for JS-ctypes, a
    foreign function interface for extensions

  • CSS Transitions
    are partially supported

  • Core Animation rendering model for plugins on Mac OS X. Plugins
    which also support this rendering model can now draw faster and more

  • Web developers can update the URL field without reloading the
    page using

    HTML History APIs

  • More responsive page rendering using

    lazy frame construction

  • Link history lookup is done asynchronously to provide better
    responsiveness during pageload

  • CSS :visited selectors have been

    changed to block websites from being able to check a user's browsing

  • New

    HTML5 parser

  • Support for more HTML5 form controls

  • Web authors can now get
    from Firefox users on Windows 7 machines

  • A

    new way of representing values in JavaScript
    that allows Firefox
    to execute heavy, numeric code (used for things like graphics and
    animations) more efficiently

Developers can find out about

all the changes and new features
at the
Mozilla Developer Center.

System Requirements

Before installing, make sure your computer meets the

system requirements


Mozilla provides Firefox*4 for Windows, Linux, and Mac*OS*X in a
variety of
. For builds for other systems and languages not provided
by Mozilla, see the Contributed Builds section at the end of this


Please note that installing Firefox*4 will overwrite your existing
installation of Firefox. You won’t lose any of your bookmarks or
browsing history, but some of your extensions and other add-ons might
not work until updates for them are made available.


You can remove Firefox*4 with the Add/Remove Programs utility on
Windows, by moving the Firefox application to the Trash on Mac OS X,
or by deleting the containing folder on Linux.

By default, removing
Firefox*4 won’t remove your bookmarks, web browsing history,
extensions or other add-ons. This data is stored in your profile
, which can be found by going to the Help menu and
selecting Troubleshooting Information.... The button next to
the Profile Directory line in Application Basics
will open your profile directory in your system's file explorer.

Please note that if you keep your profile, any version of Firefox
that you install after removing Firefox*4 will continue to use the
bookmarks, web browsing history, add-ons, and other data from this
profile folder.

Add-ons and Themes

You can get Add-ons and Themes by opening the Add-ons Manager, or by
visiting the Add-ons Web site.
Add-ons installed with previous versions of Firefox may not yet have
been updated by their authors to work with this Firefox*4. If you wish
to help test Add-ons, please

install the Add-on Compatibility Reporter
- your favorite Add-on
author will appreciate it!

Known Issues

This list covers some of the known problems with Firefox*4 which will
be resolved in future versions:

All Systems

  • Users will experience many incompatibilities with bookmarks
    and history if they downgrade to any Firefox*4 beta before beta 8.
    Users can still downgrade back to Firefox*3.6 (see

  • Users using
    Firefox Sync
    with their mobile device will need to update to
    the latest Firefox 4
    for mobile release

  • For some users, scrolling in the main GMail window will be
    slower than usual (see

  • If you try to start Firefox using a locked profile, it will
    crash (see

Microsoft Windows

  • Some users of Adobe Reader X have experienced instability when
    viewing PDF documents in the browser. Uninstalling and
    reinstalling Adobe Reader X has been determined to resolve the
    issue (see

  • If you customize your toolbars to include the Location Bar or
    Search Bar in the Menu Bar, and then toggle the state of the Menu
    Bar between shown and hidden, Firefox will crash (see

Mac OS X

  • This version of the beta will not work on Macintosh hardware
    with Power PC CPUs (see

  • Firefox on Mac OS X running in 64-bit mode does not recognize
    that Java supports certain MIME types. Running Firefox in 32-bit
    mode has been found to help (see

Linux and Unix

  • The video control buttons may not work when viewing QuickTime
    videos with libtotem (see

  • Users compiling from source might need a newer gcc and
    libstdc++ as the build requirements have changed (see


  • Poorly designed or incompatible extensions can cause problems
    with your browser, including make it crash, slow down page display,
    etc. If you encounter strange problems relating to parts of the
    browser no longer working, the browser not starting, windows with
    strange or distorted appearance, degraded performance, etc, you may
    be suffering from Extension or Theme trouble. Restart the browser in
    Safe Mode. On Windows, start using the "Safe Mode" shortcut created
    in your Start menu or by running firefox.exe -safe-mode.
    On Linux, start with ./firefox -safe-mode and on
    Mac*OS*X, run:

    cd /Applications/Firefox.app/Contents/MacOS/

    ./firefox-bin -safe-mode

    When started in Safe Mode all extensions are disabled and the
    Default theme is used. Disable the Extension/Theme that is causing
    trouble and then start normally.

  • If you uninstall an extension that is installed with your user
    profile (i.e. you installed it from a Web page) and then wish to
    install it for all user profiles using the -install-global-extension
    command line flag, you must restart the browser once to cleanse the
    profile extensions datasource of traces of that extension before
    installing with the switch. If you do not do this you may end up
    with a jammed entry in the Extensions list and will be unable to
    install the extension globally.

  • If you encounter strange problems relating to bookmarks,
    downloads, window placement, toolbars, history, or other settings,
    it is recommended that you try creating a new profile and attempting
    to reproduce the problem before filing bugs. Create a new profile by
    running Firefox with the -P command line argument, choose the
    "Manage Profiles" button and then choose "Create Profile...".
    Migrate your settings files (Bookmarks, Saved Passwords, etc) over
    one by one, checking each time to see if the problems resurface. If
    you do find a particular profile data file is causing a problem,
    file a bug and attach the file.

Frequently Asked Questions

  1. What can I do to help?

    We need help from developers and the testing community to provide
    as much feedback as possible to make Firefox even better. Please
    pick your

    favorite way to give us your feedback
    at any time!

  2. Where can I get extensions and themes (add-ons)?

    can be downloaded from
    Firefox Add-ons.

  3. Who makes Firefox*4?

    Lots of people. See Help->About Mozilla Firefox, Credits for a
    list of some of the people who have contributed to Firefox*4.

  4. Where’s the Firefox*4 source code?

    A tarball of the Firefox*4 source code is available for

    . The latest development code can be obtained through

    . Firefox-specific source is in mozilla-central's
    "browser", "toolkit", and "chrome" directories. Please follow the

  5. Where is the mail client?

    Firefox*4 works with whatever mail client is the default on your
    system. However, we recommend
    , our next-generation email client and the perfect
    complement to Firefox.

Contributed Builds

These are unofficial builds and may be configured differently than the
official Mozilla builds. They may also be optimized and/or tested for
specific platforms. You can browse through the available contributed
builds on the

FTP site

: 26-03-2011
: 26-03-2011
: 4.0
: 11.9
: free
: free
: mozilla


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