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Lost firefox

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Had Firefox update 78 for my Mac, operating sys. OS X El Capitan 10.11.8.. tried to update to 91. After update found out 91 would not work on my OS X. Npw I don't have Firefox and can't find Ver 78? help!

Had Firefox update 78 for my Mac, operating sys. OS X El Capitan 10.11.8.. tried to update to 91. After update found out 91 would not work on my OS X. Npw I don't have Firefox and can't find Ver 78? help!

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