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If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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.
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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Firefox support has ended for Mac OS X 10.6, 10.7 and 10.8 Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release Note: Firefox version 83 and higher support both Intel-based Macs (x86 architecture) and Apple devices with the new ARM-based CPU ( Apple Silicon ). The Mac OS Sierra Download is the most advanced MacOS ever and is packed with several features never seen before. It also improves files storage and security of your mac. Finally, we come to an end to this guide on Download of the Apple MacOS 10.12 Sierra.