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 OS X Lion 10.7.5 DMG is an upgrade of OS X version 10.7 to improve the stability, compatibility, and security of the Mac. It is recommended for all OS X Lion users and includes general operating system fixes. There are many great features are security tools are added to protect the Mac and user’s privacy. Download skype for os x 10.7.5 for free. Communication downloads - Skype by Skype Limited and many more programs are available for instant and free download. Mac OS X Lion (version 10.7) is the eighth major release of macOS, Apple's desktop and server operating system for Macintosh computers. A preview of Mac OS X 10.7 Lion was publicly shown at the 'Back to the Mac' Apple Special Event on October 20, 2010.

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If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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.