Firefox Download For Mac 10.7.5
Mozilla will end support for Firefox on OS X 10.6, 10.7, and 10.8 in August, 2016. At that time, Firefox will continue to function on these platforms but will no longer receive new feature or security updates. (ESR) 45 will continue to support OS X 10.6, 10.7, and 10.8 until mid-2017, but this ESR release will be the last that supports them. All three of these versions are no longer supported by Apple. Mozilla strongly encourages our users to to a version of OS X currently supported by Apple. Unsupported operating systems receive no security updates, have known exploits, and are dangerous for you to use.
Firefox For Mac 10.6.8
I find the website really useful. It give a matrix of operating systems and browsers and you can see which ones are supported. For example you can click on 10.7 under the Mac OS X heading and then choose Safari in the browsers section and see that Safari 6 is the only version supported. However, if you select just 10.7 you can see that there is a lot more versions available for Google Chrome, Firefox and Opera. As the other answers suggest, I would be very careful running outdated software as they do have known security vulnerabilities.
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