After downloading Firefox 4, it will not open.

On Mac OS10.4.11 I downloaded Firefox 4 into Applications folder, moved the icon into my menu bar, and attempted to open Firefox. A new 'notice box' appeared, "The application "Firefox" cannot be launched. -10661

Any obvious solutions you might share?
Not if you don't provide more details about what system you are using, what steps you already have done, etc.
See also this tips for quick help
http://forums.adobe.com/thread/375816?tstart=0

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