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.
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS. If you still need OS X Yosemite, use this link: Download OS X Yosemite. A file named InstallMacOSX.dmg will download to your Mac. Mac OS X Yosemite 10.10.5 Features: The latest version of Mac OS X Yosemite 10.10.5 Free Download adds some noticeable enhancements, improvements, and new features which youll experience after Mac OS X Yosemite 10.10.5 DMG Free Download: Prettier Icons: Yosemite has cleaner and clearer icons along the bottom of a Mac screen, including the apps. Download Mac OS X 10.11 El Capitan. Get download Mac OS X 10.11 EI Capitan ISO File ( 7.14GB) Mac OS X 10.11 EI Capitan DMG File (7.41GB) Download Mac OS X 10.10 Yosemite. Download Mac OS X 10.10.5 Yosemite DMG File (6.66 Gb) Mac OS X 10.10.5 Yosemite ISO File (6.66 Gb) Free Download; Download Mac OS X 10.9 Mavericks.
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.
Mac Os X 10.10 Download
Download Mac Os X Version 10.10.0
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.