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tried to download Firefox setup 6.01 exe_ and my computer wouldn't allow said it was corrupt. what to do?

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What can I do to update the latest version? How do I know if the updates are really from you? Thanks.

What can I do to update the latest version? How do I know if the updates are really from you? Thanks.

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Use Help > About Firefox and hit the Check for Updates button (if it doesn't start the "check" as soon as that window opens). That feature will only contact the Mozilla update server and then deliver the update from an official mirror website. It is all done through secure connections, no chance of the update coming from an non-official mirror.