Mac 10.11.6 version
Need version of firefox for mac 10.11.6
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Firefox since Fx 79.0 and later including the current Fx 97 and Fx 91 ESR requires Mac OS X '10.12' (ten.twelve) at minimum.
Besides updating your OS to Mac OS X 10.12 (ten.twelve) or later, the most current Firefox version you can install on mac OS 10.11.6 is Fx '78.15.0' ESR though it is EOL with no more updates.
https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr
https://www.mozilla.org/firefox/78.0/system-requirements/ https://www.mozilla.org/firefox/79.0/system-requirements/ https://www.mozilla.org/firefox/97.0/system-requirements/
In case you ever need the Firefox 78.15.0esr file. https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/ other locales at https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/