Affected users will not receive any further security updates. This was done to provide security updates until the final Firefox 78 ESR update (version 78.15.0esr) was released on October 5, 2021. These users were moved to the Firefox Extended Support Release (ESR) channel by an application update. Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Releaseįirefox version 78 was the last supported Firefox version for Mac users of OS X 10.9 Mavericks, OS X 10.10 Yosemite and OS X 10.11 El Capitan.
