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Upgrade on tewo Macs running different Mac OS's
I am on ESR on my older Mac running OS10.12.16, in order to operate Quicken 2007. However I also use a newer Mac, running OS 14.5. When I transferred my data to the newer Mac, Firefox stayed at the ESR version. Can i run a newer version of Firefox on one mac and still operate the older Mac on the ESR version? If so, how so?