I have a MacBookPro and just downloaded the new Firefox 4.0.1, whne I use the laptop wireless every the compute shuts down after a few minutes. What can I do?

I have a MacBookPro and just downloaded the new Firefox 4.0.1. When I use my laptop wireless the computer shuts down after a few minutes. What can I do?

Do you experience the same issue using other browsers, e.g. Safari?

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