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Updating to 4.0.1 "connecting to update computer" runs indefinitiely. Never gets updated.

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Trying to update to 4.0.1. "connecting to update computer' screen runs indefinitely. Never gets to update.

Trying to update to 4.0.1. "connecting to update computer' screen runs indefinitely. Never gets to update.

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Download 4.0.1 from here - http://www.mozilla.com/en-US/firefox/all.html

Un-install your current version and install the newly downloaded version.

I suspect that Google Update plugin that you have installed may have screwed up the Mozilla updates server address.