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i had firefox 3.6 which i had trouble with now i have installed 4.0....should i unstall the 3.6

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i had trouble with the 3.6 and now installed 4.0....should i unstall the 3.6 now that i have 4.0........thx's

i had trouble with the 3.6 and now installed 4.0....should i unstall the 3.6 now that i have 4.0........thx's

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There is a correct way of doing it i.e. click Help | Check For Updates in 3.6.16

If on the other hand, you downloaded 4.0.1 from Mozilla.com and it's working, then you don't have to uninstall anything. The installation will have overwritten the necessary files, so there's nothing to uninstall.