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How can I re-install Firefox v3.6.17?

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I do not like v4.0 and want v3.6.17 back. How do I do this? v4 has that irritating dotted triangle in the bottom right hand corner that does not allow me to scroll email messages.

I do not like v4.0 and want v3.6.17 back. How do I do this? v4 has that irritating dotted triangle in the bottom right hand corner that does not allow me to scroll email messages.

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