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CAN I RUN 2 VERSIONS OF FIREFOX (4.0 & 3. SIMULTANEOUSLY ON MAC OS X? HOW ?

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How can I install 2 versions of Firefox, 4.0 and an older one, simultaneously on my Mac under OS X 10.6.7 ?

How can I install 2 versions of Firefox, 4.0 and an older one, simultaneously on my Mac under OS X 10.6.7 ?

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