The very last release for 10.6.8, chronologically, is from April 2017: https://archive.mozilla.org/pub/firefox/releases/45.9.0esr/mac/en-US/ ''If you prefer a language/locale other than U.S. English, click the'' <u>..</u> ''link above the installer file name and you can choose a different folder.'' If you need a version that has later functionality, this is the highest version for 10.6.8, from August 2016, however, it has had fewer security updates than the Extended Support Release of Firefox 45: https://archive.mozilla.org/pub/firefox/releases/48.0.2/mac/en-US/ See also: [[Firefox support has ended for Mac OS X 10.6, 10.7 and 10.8]]