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Firefox is unable to update to 7.0.1. I get an error that The operation can’t be completed because the item “libsmime3.dylib” is in use. I found this is a Cisco folder, tried to trash it, but it won't leave. Maybe I need it?

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The operation can’t be completed because the item “libsmime3.dylib” is in use.

This is the error message I get when i try to install the 7.0.1 update. I found a cisco folder on my MAC and tried to Trash it. It won't leave. Maybe I need it... Some of it did Trash, but what ever is left continues to prevent 7.0.1 from installing.

The operation can’t be completed because the item “libsmime3.dylib” is in use. This is the error message I get when i try to install the 7.0.1 update. I found a cisco folder on my MAC and tried to Trash it. It won't leave. Maybe I need it... Some of it did Trash, but what ever is left continues to prevent 7.0.1 from installing.

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OK I looked at an old Apple forum and someone suggested Trash then Restart then Empty Trash, and it worked. Cisco is gone, Opt is gone, and I was able to load FireFox. I had to give admin passwords to do this too. Why an old weird game or library folder could cause such obstacles is a wonder. But I'd rather wonder about other things...