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If I upgrade from Firefox 3.6 to firefox 4 Beta on my iMac, will I still have all the same bookmarks, or will I lose them?

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If I upgrade from Firefox 3.6 to firefox 4 Beta on my iMac, will I still have all the same bookmarks, or will I lose them?

If I upgrade from Firefox 3.6 to firefox 4 Beta on my iMac, will I still have all the same bookmarks, or will I lose them?

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You are using Mac OS 10.4. Firefox 4.0 is not compatible with this OS. It supports only Mac OS 10.5 and above. Please see this article: Firefox 4 system requirements.