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My computer doesn't support latest version

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I downloaded newest version of Firefox and didn't realize it would work on my computer (IMac) OS X El Capitan 10.11.6. I read that version 78 is the most current one that will work. How do I download that?

I downloaded newest version of Firefox and didn't realize it would work on my computer (IMac) OS X El Capitan 10.11.6. I read that version 78 is the most current one that will work. How do I download that?

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Fx 78.15.0esr released on Oct 5th was the last update for the now EOL FX 78 ESR.

https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/ or if you prefer another locale https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/

Also https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr


Moved thread from Firefox for iOS to Firefox section as iOS is iPhone/iPad.

Modified by James