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What is this " URGENT! Your version of Firefox is no longer protected against online attacks. Get the upgrade - it’s fast and free! ? It comes up when I log on

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This showed up today when I went online. I do not know if it is legit or what. What do I do?

This showed up today when I went online. I do not know if it is legit or what. What do I do?

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The Firefox 3.5.x branch has reached end-of-life and is no longer maintained.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.