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I was recently prompted to d/l the most recent V. To install OS X 10.8 Mountain Lion, 10.9 Mavericks (currently unavailable) or OS X 10.10 Yosemite.you need one of these Macs: OS X 10.8 Mountain Lion purchased emailed download code here. Mac OS X v10.6.6 or later to install via the Mac App Store (v10.6.8 recommended) 7 GB of available disk space.
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While insecure versions of Firefox will continue to work on OS X 10.8 and earlier, using an up-to-date version of Firefox on a supported version of Mac OS will provide you with the best and safest. Note: If you have Mac OS X 10.7 (Lion) or 10.6 (Snow Leopard), you will need to download OS X El Capitan before you can upgrade to the latest Mac OS. I've tried getting El Capitan from Apple but the d/l won't even start. Of firefox for my old macbook running 10.6.8 and AFTER REPLACING the older V.
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