These users will be moved to the Firefox Extended Support Release (ESR) channel by an application update. Get Firefox for Windows, macOS, Linux, Android and iOS today! Firefox version 78 is 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. Firefox is created by a global non-profit dedicated to putting individuals in control online. Download Mozilla Firefox, a free Web browser. It will automatically detect the platform and language on your computer and recommend the best version of Firefox for you. Visit the Firefox download page in any browser (for example, Safari).
Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release Installing Firefox on Mac.