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.
Mac users interested in Mozilla for os x 10.6.8 generally download: Firefox 82.0 Free Firefox is one of the most popular web browsers on the market, providing numerous helpful features and quick speed to millions of users worldwide. Free tenfourfox download for mac 10.6.8. Internet & Network downloads - TenFourFox by and many more programs are available for instant and free download. A fork of Firefox to maintain support for the Power Mac, supporting Mac OS X 10. AuroraFox is built on the foundation of TenFourFox and sources from the Aurora channel of Mozilla.
If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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.
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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.