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How do I upgrade the firefox version I have on my computer?

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I received a message stating that the old version was not working after Oct. 2013. I would like to be able to use firefox, but it doesn't respond at present. Should I upgrade, or is this temporary?

I received a message stating that the old version was not working after Oct. 2013. I would like to be able to use firefox, but it doesn't respond at present. Should I upgrade, or is this temporary?

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