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Which one of the Firefox's should I set up for Android cellphone, Smartphone, and what is Mozilla do I have to get it to ? And there was something about OS do I need it

Which one of the Firefox's should I set up for Android cellphone, Smartphone, and what is Mozilla do I have to get it to ? And there was something about OS do I need it

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Oops, your question duplicated. I replied here: https://support.mozilla.org/questions/1018662