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Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release
Firefox 78 was the last supported version for Mac OS X 10.9, 10.10 and 10.11. Users were moved to Firefox Extended Support Release (ESR).
Firefox ESR release cycle
Firefox offers an Extended Support Release (ESR) based on a regular release of Firefox for desktop for use by organizations. Learn more.
Customize Firefox using Group Policy (Windows)
Firefox supports setting policies via Active Directory as well as using Local Group Policy.
Choose a Firefox update channel
How to choose between rapid release and extended support release (ESR).
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