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.

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.

Mac users can officially download all latest updates of OS X 10.9 Mavericks via Mac App Store for Free. For manual installation of OS X 10.9.4 via iTunes on multiple computers/laptops, The official Direct Download Links of OS X Mavericks 10.9.4 Standalone Setup Installer.DMG File and OS X Mavericks 10.9.4 Update.DMG File is available below. Apple mac update os 10 9 free download - Apple Mac OS Update 9.0.4, Apple Mac OS 9.1 Update, Apple Mac OS Update 8.6, and many more programs.

Mac Os X 10.9 Update 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 Update 10.9 Download Free

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.