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Bumping into incompatiblities with certain sites using 5.0

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I recently upgraded to 5.0, but have since realized the rest of the world hasn't quite caught up to you yet, so I need to uninstall 5.0 and reinstall 4.0. The problem is that I am unable to find a mac link to download 4.0. Please help as I would love to keep using firefox!

I recently upgraded to 5.0, but have since realized the rest of the world hasn't quite caught up to you yet, so I need to uninstall 5.0 and reinstall 4.0. The problem is that I am unable to find a mac link to download 4.0. Please help as I would love to keep using firefox!

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