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do I install ver 4 over 3.6 or uninstall 3.6 then install upgrade 4 fresh??

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what is the proper way to install version 4 of fire fox ? do I install it over version 3.6 ? or Do I uninstall version 3.6 then Install version 4 fresh? Foot print and clean install concerns.

what is the proper way to install version 4 of fire fox ? do I install it over version 3.6 ? or Do I uninstall version 3.6 then Install version 4 fresh? Foot print and clean install concerns.

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your best bet is to not upgrade to 4