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.

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If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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

Google Chrome is a lightweight browser that is free to download for Windows, Mac OS X, Linux, Android, and iOS. Follow this guide to get it downloaded and in. First of all, unless you have some very specific reason for 10.7.5, you shouldn’t be running it. Almost any machine that can run 10.7 can run 10.12 and should be with few exceptions. Chrome has also gotten noticeably worse since it first came out.

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Note: If you have Mac OS X 10.7 (Lion) or 10.6 (Snow Leopard), you will need to download OS X El Capitan before you can upgrade to the latest Mac OS.

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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.