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URL: https://support.mozilla.org/en-US/kb/firefox-osx

⇱ Firefox support has ended for Mac OS X 10.6, 10.7 and 10.8 | Firefox Help

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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This article is no longer maintained, so its content might be out of date.

This article applies to Mac users only.

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If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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.

Note: If you have Mac OS X 10.7 (Lion) or 10.6 (Snow Leopard), you will need to download OS X El Capitan before you can upgrade to the latest Mac OS.

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.


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