I keep getting MACDefender pop-up on my screen but I have not installed/downloaded etc. How can I stop this pop-up?

Any advice on how to block this pop-up? It asks to install/run scan etc but narturally I just click on the 'x' close window button.

Don't install it.  and go here for information:
http://www.reedcorner.net/news.php/?p=138 and
http://www.reedcorner.net/guides/macvirus/
Do as search on the forum for more threads about this.
Laverne's mom

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    Sounds like it is hanging when you exit and later try to restart Firefox.
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