Firefox 4.0 keeps locking up and is slow to load pages

I just installed 4.0 this morning. Ever since, Hotmail is extremely slow to load, it keeps locking up or not responding.
I thought this was supposed to be faster and more streamlined?
Now, when I try to go back and install 3.6.13 it is no longer available. What gives? I want my old Firefox back.

http://www.mozilla.com/en-US/firefox/all-older.html

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