įirefox ESR and its limited feature changes were designed for enterprises that valued stability over sexy new functionality. While that and Firefox 78 will be identical, when the latter shifts to version 79 four weeks later, ERS will remain at 78, increased to 78.1 to mark its first security update. On that date, users of Firefox still running OS X 10.9 (Mavericks), 10.10 (Yosemite) and 10.11 (El Capitan) on their Macs will instead be shunted to the extended channel and given 78.0 ESR. The move, a first step towards dropping all support, will take place June 30, when Mozilla releases Firefox 78. Mozilla this week announced it would automatically move users running outdated versions of macOS to the Firefox Extended Support Release (ESR), an edition that provides security updates only.
