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I have downloaded Firefox 4 and when I open Firefox again I get the message that my version is not safe from online attacks, so why?

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I opened Firefox and got the message that I needed to download 4 because my version was not safe from attacks. I downloaded 4 and then I quit Firefox and reopened it, and got the same message as before. I am probably doing something incorrectly, but I have no idea what that could be. Thanks.

I opened Firefox and got the message that I needed to download 4 because my version was not safe from attacks. I downloaded 4 and then I quit Firefox and reopened it, and got the same message as before. I am probably doing something incorrectly, but I have no idea what that could be. Thanks.

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The Firefox 3.5.x branch has reached end-of-life and is no longer maintained.
You will no longer receive security updates.

You can update Firefox via "Help > Check for Updates" or download and install the latest Firefox 3.6.x or 4.0.x version.