I recently updated to Mac OS 10.6.5 so Firefox will not quit (unless forced to quit), and I get the following error message. "The application Firefox.app can't be opened -600." Same problem with Safari, Google Earth, I-Tunes, and Adobe Acrobat Reader.

I have to actually force quit these applications for this to work. How do I fix this. I also upgraded to Firefox 3.6.13.

Hi there,
You're running an old version of Safari. Before troubleshooting, try updating it to the latest version: 6.0. You can do this by clicking the Apple logo in the top left, then clicking Software update.
You can also update to the latest version of OS X, 10.8 Mountain Lion, from the Mac App Store for $19.99, which will automatically install Safari 6 as well, but this isn't essential, only reccomended.
Thanks, let me know if the update helps,
Nathan

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