Starting with Firefox version 49, Firefox requires Mac OS X 10.9 (Mavericks) or higher. Visit this Apple Support page to find your Mac OS version.
If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version that Apple supports. Visit this Apple Support page to learn more about upgrading your Mac.
Mac Os X 10.9 Update Download
- Build your future. Whether you’re just entering the workforce or you‘re an experienced developer or entrepreneur, take advantage of free resources to gain skills that help you succeed in Apple’s growing app economy, which provides millions of jobs in technology across the globe.
- Visit this Apple Support page to find your Mac OS version. If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version that Apple supports. Visit this Apple Support page to learn more about upgrading your Mac.
- Mac OS X Public Beta; Mac OS X 10.0 (Cheetah) Mac OS X 10.1 (Puma) Mac OS X 10.2 Jaguar; Mac OS X 10.3 Panther; Mac OS X 10.4 Tiger; Mac OS X 10.5 Leopard; Mac OS X 10.6 Snow Leopard; Mac OS X 10.7 Lion; OS X 10.8 Mountain Lion; OS X 10.9 Mavericks; OS X 10.10 Yosemite; OS X 10.11 El Capitan; macOS 10.12 Sierra; macOS 10.13 High Sierra; macOS.
Mac Os X 10.9 Update To 10.10
Mac Os X 10.9 Combo Update
While insecure versions of Firefox will continue to work on OS X 10.8 and earlier, using an up-to-date version of Firefox on a supported version of Mac OS will provide you with the best and safest user experience.
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