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I have mac10.4.11. How do I get upgrade to mac 5 & then mac 6?

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Bi8# * Numbered list item

Bi8# * Numbered list item

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Firefox 4 upwards require at least OS X 10.5

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Try Apple Support or a Mac UserGroup for help with that, it really isn't a Firefox support issue and we don't have a Mac guru helping out in this forum.