Cant install Firefox Browser on Mac OS X El Capitan 10.11.6
Unable to install Firefox on Mac Book Air OS X El Capitan 10.11.6
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Firefox since Fx 79.0 and later including the current Fx 96 and 91 ESR requires macOS 10.12 (ten.twelve) at minimum.
Besides updating your OS to macOS 10.12 or later, the most current Firefox version you can install on macOS 10.9, 10.10 and 10.11 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/96.0/system-requirements/
Firefox 78.15.0esr can be downloaded from below links. 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/
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