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My computer says I don't have enough privileges to replace vers. 3.6.4 with 3.6.6

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My mac won't let me replace Firefox 3.6.4 with 3.6.6 because I don't have enough privileges. What do I need to do.

== I downloaded 3.6.6, even after I rebooted.

My mac won't let me replace Firefox 3.6.4 with 3.6.6 because I don't have enough privileges. What do I need to do. == I downloaded 3.6.6, even after I rebooted.

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Make sure you are using the same OSX account you used to install 3.6.4.