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I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?

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I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?

I have a big crossbar mark over my FF4 icon after I've installed and replaced FF3. When I try to open the software, I get "You can't open the application "Firefox" because it is not supported on this architecture." What's up with that?