Firefox 4 is not compatible with original box, I have download Firefox 3.6.16?

Today, I deleted Firefox 3.6.16 and downloaded Firefox 4 and immediately began to have problems related to the functions to Ancestry.com , who advised me that Firefox 4 is not currently compatible with Ancestry.com. I'd rather not use internet explore and really need to re - install Firefox 3.6.l6 am I able to do this? Help, please!

http://www.Mozilla.com/en-us/Firefox/all-older.html

http://support.Mozilla.com/en-us/KB/installing+a+previous+version+of+Firefox

Tags: Firefox

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