Aug 03, 2021 For Mac OS X El Capitan, macOS High Sierra, macOS Mojave or macOS Catalina, Open Safari and click on this link, How to get old versions of macOS – Apple Support. Go to the Download OS section and click on the OS you want to install. Before upgrading make a full back up of your Mac. Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, and macOS High Sierra 10.13.6 Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash Description: A memory corruption issue was addressed with improved memory handling. CVE-2018-4270: found by OSS-Fuzz WebKit. Download Mac OS X El Capitan now from Softonic: 100% safe and virus free. More than 2771 downloads this month. Download Mac OS X El Capitan latest ver.

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.This tutorial is also now available within our. If your Mac isn't compatible with the latest macOS, you might still be able to upgrade to an earlier macOS, such as macOS Catalina, Mojave, High Sierra, Sierra, or El Capitan. To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date.

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If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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

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.