Firefox support has ended for Mac OS X 10.6, 10.7 and 10.8 Firefox 45.9.0esr will be the most up to date version with security fixes that will run. The Firefox 48.0.2 was released August 24, 2016 and is missing several security updates that the Firefox 45.9.0esr released on April 19, 2017 has.
If it would be crucial to solving the problem with v 49, I could repeat the download and installation in order to generate (and this time, save) the crash log. Nonetheless, that might not be worth the bother if it's established that, in fact, v 49 isn't designed to work with OS 10.6.8 in the first place. Thunderbird Mac OS X VERY SLOW. User Help for Mozilla Thunderbird. 7 posts • Page 1 of 1. Posted October 21st, 2005, 5:13 pm. Then, I downloaded the latest version: version 1.0.7 (20050923) and installed it.