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I need to use firefox 3.0 how do I install it?

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in order to use an online school program I need to use firefox 3.0 right now I have a newer version,how do I install the 3.0 ?

in order to use an online school program I need to use firefox 3.0 right now I have a newer version,how do I install the 3.0 ?

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You can install the portable Firefox 3.6.20 version to access websites that do not work with Firefox 5+.