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Can I revert to Firefox 3.6.18 if I don't like Firefox 5? (Firefox 4 was a disaster when I tried it on another machine!)

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I did not like Firefox 4 when I tried it on another machine.

Can I revert to 3.6.18 after upgrading to 5?

I did not like Firefox 4 when I tried it on another machine. Can I revert to 3.6.18 after upgrading to 5?

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