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 Snow Leopard Price
If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version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.
Web Browser For Snow Leopard
Firefox Snow Leopard Free Version Of Likewise, Mountain Lion share dropped precipitously shortly after 10.9 Mavericks arrived, the first free version of OS X, soon falling below Snow Leopard. And with the arrival of 10.10 Yosemite, Mavericks began its inevitable decline and in coming months it could also fall behind Snow Leopard. Mozilla Firefox is a graphical web browser developed by the Mozilla Corporation and a large community of external contributors. Firefox started as a fork of the Navigator browser component of the Mozilla Application Suite. Like Chrome, Firefox is also way behind the times. Snow Leopard users can run version 38, but Leopard users only get. I've changed the OS 10.6.8 'Snow Leopard' language to French. This configuration with a highly 'tweaked' FireFox 8.0.2 browser in English (updated from FireFox 10.0.1) worked a treat, and the laptop ran splendidly. I now wish to find the equivalent i.e. Latest FireFox browser in French, and this is where I'm having difficulties.
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.