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Can't use ancestry.com with Firefox 4. How do I go back to a legacy version?

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I cannot use many of the features on my favorite website, ancestry.com since upgrading to Firefox 4. How can I go back to 3.6, a version that IS compatible with this website?

I cannot use many of the features on my favorite website, ancestry.com since upgrading to Firefox 4. How can I go back to 3.6, a version that IS compatible with this website?

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