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Why does my Avast! antivirus program say that Firefox is malware and could be infected and that it stopped my pc from crashing when Firefox opens up?

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My Avast! antivirus warns me about a possible computer crash when the Firefox opens up. It does this every time.

My Avast! antivirus warns me about a possible computer crash when the Firefox opens up. It does this every time.

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I trust that you are aware that Firefox 5.0 is no longer supported, and that Firefox 10.0 is due to be released today.

Please provide a screenshot of those messages from AVG.
https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem