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Firefox 4 not compatible with Ancestry can I download Firefox 3.6.16?

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Today I removed Firefox 3.6.16 and downloaded Firefox 4 and immediately began having problems with functions in Ancestry.com who advised me that Firefox 4 is not currently compatible with Ancestry.com. I prefer not to use internet explorer and really need to re-install Firefox 3.6.l6 am I able to do this? Please help!.

Today I removed Firefox 3.6.16 and downloaded Firefox 4 and immediately began having problems with functions in Ancestry.com who advised me that Firefox 4 is not currently compatible with Ancestry.com. I prefer not to use internet explorer and really need to re-install Firefox 3.6.l6 am I able to do this? Please help!.

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Many thanks for your help the-edmeister, I have now re-installed Firefox 3.l6.6 and am back in familiary territory.