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I want to upgrade my Firefox version 2.0.0.20. My Mac system version is 10.3.9. Newest update won't work. What can I do?

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I want to upgrade my Firefox version 2.0.0.20. My Mac system version is 10.3.9. Newest update won't work. What can I do?

I want to upgrade my Firefox version 2.0.0.20. My Mac system version is 10.3.9. Newest update won't work. What can I do?

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Nothing - Firefox 2.0.0.20 is the last ever release for Mac OSX 10.3.9 and earlier versions.