What's New in Firefox 184.108.40.206 Firefox 220.127.116.11 is a stability and security update that is part of our ongoing program to provide a safe Internet experience for our customers. We recommend that all users upgrade to this latest version. Here's what's new in Firefox 18.104.22.168: * Improved stability. * Improved support for Mac OS X. * International Domain Name support for Iceland (.is) is now enabled. * Fixes for several memory leaks. * Several security enhancements.