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I have 4.0 firfox on my mac bookpro, but for my work I need firefox 3.6. What do I need to do?

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I need to download 3.6 firefox on my macbook pro. I currently have the 4.0 on my macbook pro. Is it possible to download the 3.6 version with the 4.0 version already on my computer?

I need to download 3.6 firefox on my macbook pro. I currently have the 4.0 on my macbook pro. Is it possible to download the 3.6 version with the 4.0 version already on my computer?

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If you want to revert to 3.6, trash Firefox 4 then download and install Firefox 3.6, available from http://www.mozilla.com/en-US/firefox/all-older.html