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PDFs don't work right in FF 4 or 5. How do I load a stable FF3 version?

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I go to various credit card companies and try to download copies of bills. This worked in Firefox 3, but does not work well in FF4 or 5. Since you don't seem able to fix it, how do I revert to FF3, latest stable version?

I go to various credit card companies and try to download copies of bills. This worked in Firefox 3, but does not work well in FF4 or 5. Since you don't seem able to fix it, how do I revert to FF3, latest stable version?

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