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How do I go back to 3.6.10 don't like this set up

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My husband does not like 4.o so I would like to go back to 3.6.10 version

My husband does not like 4.o so I would like to go back to 3.6.10 version

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Please read this thread and follow TonyE instructions:

http://support.mozilla.com/bs/questions/797708