Download the beta for the new Firefox 57 Quantum now In Firefox's relentless battle to take on the impregnable Chrome, they've hit a huge milestone with version 57 of their browser. The beta for it is out now for download and includes the new Servo engine whose performance couldn't be more heartening: Firefox is now twice as fast as it was a.

• Get Firefox, a free web browser backed by Mozilla, a non-profit dedicated to internet health and privacy. Available now on Windows, Mac, Linux, Android and iOS.
• Firefox Lockwise. Take the passwords you’ve saved in Firefox with you everywhere. Download for iOS; Download for Android; Support; Firefox Monitor. See if your personal info has been leaked online, and sign up for future breach alerts.

Starting with Firefox version 49, Firefox requires Mac OS X 10.9 (Mavericks) or higher. Visit this Apple Support page to find your Mac OS version.

If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version that Apple supports. Visit this Apple Support page to learn more about upgrading your Mac.

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While insecure versions of Firefox will continue to work on OS X 10.8 and earlier, using an up-to-date version of Firefox on a supported version of Mac OS will provide you with the best and safest user experience.