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Firefox

Mozilla Firefox is one of the most popular browser choices, offering high speeds and displays versatility when you add plugins. The program is extremely light on your computer resources.

Before Chrome, there was Firefox

Firefox 21 is due to officially launch on Tuesday, but you can grab the desktop version now from Mozilla’s servers here: FTP. If you prefer to wait for the official launch, keep your browser. Click the DOWNLOAD NOW button to download an official version of Firefox. The file will download, click on it and it will begin the installation process. If you had Firefox on your computer in the past, you’ll have the option to keep your old settings or go back to the default.

Experience a fast and reliable browser that is versatile and feature-rich when you use Mozilla Firefox.

You’ve probably heard of Mozilla Firefox, one of the most used desktop browsers available. Firefox competes with other popular browsers such as Google Chrome and Opera Browser. Arguably, Mozilla offers the fastest speeds available for browsing the web.

Internet browsers are notorious for eating your computer’s resources. This is especially visible in Google Chrome’s consumption of almost all of a computer’s RAM. However, Mozilla Firefox is lightweight, meaning it won’t consume all of your computer’s resources. It uses thirty percent less memory than Chrome does. Yet, speed and performance is not sacrificed by this software being lightweight.

Your privacy is ensured when you use Mozilla Firefox, the security features on this program include anti-tracking to ensure your location stays hidden. However, you’ll find that there are fewer extensions available for Firefox compared to Chrome. There’s also no live support to answer any queries you may have.

When you’re browsing the Internet, you may want to save a few websites, which is a great idea. However, you may regret doing this as bookmarks you’ve made are hard to find. Unless you organize the tab constantly you won’t be able to view your old bookmarks easily. But, for all the bad in this application, it’s speed and compatibility with most systems makes up for its shortcomings.

Where can you run this program?

Firefox is available for Windows, Mac, Linux, Android, and IOS devices.

Is there a better alternative?

No, when it comes to browsers you can’t expect a one-size-fits-all solution. You’ll need to take a look at everything and decide what features you want more than others.

Our take

Mozilla Firefox is a great browser that’s lightweight and offers high speeds. Yet by offering these, it doesn’t compromise on security and privacy.

Should you download it?

Yes, if you’re looking for a fast, system-friendly and versatile browser then this is the optimal choice for you. Offering extension support means you’ll be customizing Mozilla to your personal needs.

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Firefox (English (US) Other Systems and Languages)

  • Windows
  • Linux
  • Mac OS X

Systems & Languages Release Notes Privacy

Firefox 3.6 Release Notes

v.3.6.21, released August 30th, 2011
Check out what’s new, the known issues and frequently asked questions about the 3.6 version of Firefox. As always, you’re encouraged to tell us what you think, either using this feedback form or by filing a bug in Bugzilla.

We strongly recommend that all Firefox 3.6 users upgrade to the very latest version available.

What’s New in Firefox 3.6.21

Firefox 3.6.21 fixes the following issues found in previous versions of Firefox 3.6:

  • Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance (see bug 682927 and the security advisory)

You may also be interested in the Firefox 3.6.20 release notes for a list of changes in the previous version.

System Requirements

Before installing, make sure your computer meets the system requirements.

Downloading

Mozilla provides Firefox 3.6 for Windows, Linux, and Mac OS X in a variety of languages. You can get the latest version of Firefox 3.6 here. For builds for other systems and languages not provided by Mozilla, see the Contributed Builds section at the end of this document.

Installing

Please note that installing Firefox 3.6 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 reinstall an older version later if you wish to downgrade.

Uninstalling

You can remove Firefox 3.6 through the Control Panel in the Start Menu on Windows, by removing the Firefox application on OS X, or by removing the firefox folder on Linux.

By default, removing Firefox 3.6 won’t remove your bookmarks, web browsing history, extensions or other add-ons. This data is stored in your profile folder, 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 3.6 will continue to use the bookmarks, web browsing history, add-ons, and other data from this profile folder.

Extensions and Themes

Extensions installed under Firefox 3.5 may be incompatible and/or require updates to work with Firefox 3.6. Please report any issues to the maintainer of the extension. When you install Firefox 3.6 all of your Extensions and Themes will be disabled until Firefox 3.6 determines that either a) they are compatible with the Firefox 3.5 release or b) there are newer versions available that are compatible.

Known Issues

This list covers some of the known problems with Firefox 3.6, which will be resolved in future releases:

Download Firefox 21 Mac

Download Firefox 21 Mac Os

All Systems
  • If FIPS mode is enabled and certain files have been removed from the system, the browser may crash on startup (see bug 522041)
Microsoft Windows
  • Content over certain Flash videos may not disappear when the video plays (see bug 571313)
  • Older Flash videos on Download.com may fail to play. CNet has been notified of the issue (see bug 569104)
  • Some slower machines may see degraded mouse responsiveness when viewing certain Flash videos (see bug 561818)

Download Firefox 21 Mac Desktop

Linux and Unix
Download Firefox 21 Mac
  • Firefox may have difficulty playing system sounds in some distributions of Linux (see bug 536996)
  • Zooming out on some sites may result in grey or black lines appearing (see bug 468496)

Firefox 21 Download

Troubleshooting

  • 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 read these notes and the bug filing instructions before reporting any bugs to Bugzilla. You can also give us your feedback through this feedback form.

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

    Extensions and Themes can be downloaded from Firefox Add-ons.

  3. Who makes Firefox 3.6?

    Lots of people. See Help->About Mozilla Firefox, Credits for a list of some of the people who have contributed to Firefox 3.6.

  4. Where’s the Firefox 3.6 source code?

    A tarball of the Firefox 3.6 source code is available for download. The latest development code can be obtained through Mercurial. Firefox-specific source is in mozilla-central's 'browser', 'toolkit', and 'chrome' directories. Please follow the build instructions.

  5. Where is the mail client?

    Firefox 3.6 works with whatever mail client is the default on your system. However, we recommend Mozilla Thunderbird, 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.

Other Resources and Links

The following resources contain useful information about Firefox 3.6

  • SafeBrowsing Service Privacy Policy (for anti-phishing/anti-malware feature)