Firefox 188.8.131.52 a security update has been released. See Firefox 184.108.40.206 Release Notes for more details. Users may obtain Firefox 220.127.116.11 manually via the Check for Updates… option from the Help menu. Automatic upgrade (for those who have this feature enabled) should occur within the next 24-48 hours. Alternatively, users may also download Firefox 18.104.22.168 directly by going to http://getfirefox.com.
News Source: Mozilla Developers News