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How do I return to the previous firefox app - this 4.0 upgrade is crap - I am furious

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I downloaded your upgrade to firefox 4.0 and I hate it!! How can you provide such a lame upgrade? Nothing is working properly. My autofill doesn't work - my google dropdown doesn't work, my navigation bar is all screwed up. I don't want your stupid navigation bar - I use google and the windows navigation bars. GET THIS OFF MY COMPUTOR!!!!!!!!!!!!!!!!!!!

I downloaded your upgrade to firefox 4.0 and I hate it!! How can you provide such a lame upgrade? Nothing is working properly. My autofill doesn't work - my google dropdown doesn't work, my navigation bar is all screwed up. I don't want your stupid navigation bar - I use google and the windows navigation bars. GET THIS OFF MY COMPUTOR!!!!!!!!!!!!!!!!!!!

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