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Not compatible with v10.11.6

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The latest version does not work with my version of Apple OS on my older OS El Capitan v10.11.6. When downloading and replacing the old version I get an incompatibility warning that Firefox needs 10.12 or later yet there is no upgrade available to 10.12, I need my FireFox!!! Help

The latest version does not work with my version of Apple OS on my older OS El Capitan v10.11.6. When downloading and replacing the old version I get an incompatibility warning that Firefox needs 10.12 or later yet there is no upgrade available to 10.12, I need my FireFox!!! Help

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