The all new OS X 10.11.6 for Mac has been released by Apple as beta update for OS X developers and non-developers (public beta testers). Mac OS X El Capitan 10.11.6 Beta (Build: 15G26a) is now available for update / upgrade / installation on Mac devices running an old OS X versions. The Direct Download Links of OS X 10.11.6 Beta Delta / Combo.DMG Update Files are available below. 2018 Update: WARNING DO NOT UPDATE TO SECURITY UPDATE 2018-001! Safe security update download (2017-005):ht. 7/10 (239 votes) - Download macOS El Capitan Mac Free. The twelfth version of Mac OS X appeared in 2015. MacOS El Capitan is the successor to Yosemite with improvements to its functions and graphical performance. MacOS is the current name of the former OS X, previously known as Mac OS X.

Firefox version 78 is the last supported Firefox version for Mac users of OS X 10.9 Mavericks, OS X 10.10 Yosemite and OS X 10.11 El Capitan. These users will be moved to the Firefox Extended Support Release (ESR) channel by an application update. This will provide security updates until the next ESR update in July 2021, after which the affected users will no longer receive security updates.

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While Apple does not have a public policy governing security updates for older OS X releases, their ongoing practice has been to support the most recent three releases. The last security update applicable to OS X 10.11 was made available in July 2018. Unsupported operating systems do not receive security updates, have known exploits and can be dangerous to use, which makes it difficult to maintain Firefox on those versions.

Up until July 2021, we will be updating affected users with critical security updates through the Firefox ESR channel to help retain the best possible security. After this, no security updates will be provided.

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If you want to keep your Firefox version up to date, you will need to upgrade your operating system to macOS 10.12 or higher. Older versions that are not supported by Apple are unreliable and unsafe to use, which also makes it difficult to maintain Firefox on those versions.