Firefox 4 for Mac is slow and Java doesn't work. How do I go back to 3?

I dropped version 4 because it slowed my entire computer. there was a constant network load whenever firefox was on. I couldn't use any Java apps like Webex. I couldn't even use your site. I have to send this comment using safari because it waould take forever to type. Since I tossed Firefox 4, my computer has recovered and operates properly. I reloaded Firefox 3 and it seems to back to "normal". I did all the recommendations. I turned off all add-ons. made sure they were all up to date. turned them on one at a time.
I can't use version 4.0

How can I go back to version 3? Thanx.

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