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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).
Choose a Firefox update channel
How to choose between rapid release and 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.
Legacy browser support extension for Windows
Add-ons and older versions of Firefox ESR may enable your users to run legacy add-ons and view websites that require Internet Explorer.
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