How do I de-install Firefox 4 and return to the previous version?

Firefox 4 is incredibly slow. It is making it very difficult for me to work on the internet. I want to de-install it and return to the previous version, which was much faster. Please advise me about how to de-install Firefox 4. thank you, sj

I decide to go through and thin out my add-ons anyway, but it definitely was an add-on that was causing the slow-down. Now it's blazing again.
Add-ons I disabled (ie, one of these or combination of, is the bad guy):
* Measure It
* Rainbow
* Tag in Text Area
* Define
Still Good Guys:
* StumbleUpon
* Firebug
* Ad-Block
* Greasemonkey
* XMarks

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