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.

OS X 10.11.4 El Capitan Update Available to Download. I just spent 2hrs 40 mins just to install OS X 10.11.4,still when I try to update my o-photos using Itunes,the system again requested for OS X 10.11.4 to be installed. The OS X El Capitan v10.11.2 Update is recommended for all OS X El Capitan users. The OS X El Capitan v10.11.2 update improves the stability, compatibility, and security of your Mac, and is recommended for all users. This update: Improves Wi-Fi reliability. Improves the reliability of Handoff and AirDrop. Fixes an issue that may cause Bluetooth.

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.

Apple Yosemite 10.10 Download

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.

Mac Os 10.10 Iso Download

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.