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I am unable to upgrade to Firefox 4. I have upgraded my operating system .

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Although I have upgraded the operating system on my iBookG4 to Mac OS X 10.5.8, I am still unable to download the latest upgrade to Firefox 4. I currently am receiving security warnings on websites that I often visit. I have been told to switch to Safari, I prefer not to. Please advise.

Although I have upgraded the operating system on my iBookG4 to Mac OS X 10.5.8, I am still unable to download the latest upgrade to Firefox 4. I currently am receiving security warnings on websites that I often visit. I have been told to switch to Safari, I prefer not to. Please advise.

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