Keep in mind that Microsoft retired Mainstream Support for Windows XP on Apand then pulled Extended Support for the operating system on April 8, 2014. It’s unfortunate that Mozilla is not doing the same with old Windows versions. Mozilla correctly notes that “all three of these versions are no longer supported by Apple” and that “unsupported operating systems receive no security updates, have known exploits, and are dangerous for you to use.” If you want to continue getting Firefox updates, the company thus recommends upgrading your Mac. Firefox ESR releases are maintained for one year, and so Mozilla will continue to support it on OS X 10.6, 10.7, and 10.8 “until mid-2017.” Firefox ESR 45 will be the last version that supports these old OS X versions.
Mozilla also offers a Firefox version called Extended Support Release ( ESR) for schools, universities, businesses, and others who need help with mass deployments.
