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Using Mozilla on Mac El Capitan Operating System

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What version, if any, functions well with the older Mac El Capitan operating system? It would be running on a 17", 2008 MacBook Pro.

What version, if any, functions well with the older Mac El Capitan operating system? It would be running on a 17", 2008 MacBook Pro.

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It would be 78.15 ESR. See Firefox System Requirements.

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Can you post a download link to that version, please?

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cor-el trɔe