Firefox 4 beta for 64 bit user

I spend whole weekend to figure out why I am unable to run firefox 4 on my 64 bit machine..

Actually whenever I was downloading, I was getting 32 bit firefox.. The correct url for downloading firefox  for 64 bit is 

Firefox 4.0.1

http://ftp.jaist.ac.jp/pub/mozilla.org/firefox/releases/4.0.1/linux-x86_64/en-US/firefox-4.0.1.tar.bz2 64 bit version too..

Firefox 5 beta

http://ankeena.mozilla.org/pub/mozilla.org/firefox/releases/5.0b2/linux-x86_64/en-US/firefox-5.0b2.tar.bz2

By- Narendra Sisodiya