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.
The latest Hackintosh OS X El Capitan 10.11.5 Mac operating system is now available for Microsoft Windows device users to experience the all new features and functionalities of OS X El Capitan 10.11.5 (Build: 15F34) on Windows PCs and Laptops powered by AMD and Intel based hardware. Xcode 7 beta includes SDKs for watchOS 2.0, iOS 9 and OS X version 10.11. To develop apps targeting prior versions of OS X or iOS, see the section “About SDKs and the Simulator” in What's New in Xcode available on developer.apple.com or from the Help What's New in Xcode command when running Xcode.
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.
Download Xcode For El Capitan
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.
Os X Yosemite
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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.