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Firefox and OSX compatibility....(older versions, Sierra 10.12.6)

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Can anyone confirm if the latest version of Firefox 91.0.2 will install and run (using standalone installer)on OSX Sierra 10.12.6 ? I assume not but just checking. Helping a friend. My research suggests not. Best, last compatible version i can see would be possibly version 48.0 or if not version 45.9.0esr ? Would appreciate quick response if possible as have to talk friend through update as soon as i can. Much appreciated.

Can anyone confirm if the latest version of Firefox 91.0.2 will install and run (using standalone installer)on OSX Sierra 10.12.6 ? I assume not but just checking. Helping a friend. My research suggests not. Best, last compatible version i can see would be possibly version 48.0 or if not version 45.9.0esr ? Would appreciate quick response if possible as have to talk friend through update as soon as i can. Much appreciated.

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James
James
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Mac OS 10.12 is the minimum listed for Firefox 91.0.2 at https://www.mozilla.org/en-US/firefox/91.0.2/system-requirements/

Mac OS 10.12 has been the minimum since Fx 79.0 Release as 78.0 had listed 10.9, 10.10, 10.11 as minimum.

https://www.mozilla.org/en-US/firefox/80.0/system-requirements/ https://www.mozilla.org/en-US/firefox/79.0/system-requirements/ https://www.mozilla.org/en-US/firefox/78.0/system-requirements/

Modified by James