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Firefox crashed and said it needed an update. Updated to newer Firefox but it won't install.

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Firefox crashed and said it needed an update. Updated to newer Firefox but it won't install. Error message,The operation can’t be completed because the item “libsmime3.dylib” is in use.",have closed everything even shut down,restarted computer several times. I just also updated my plug-ins.

Firefox crashed and said it needed an update. Updated to newer Firefox but it won't install. Error message,The operation can’t be completed because the item “libsmime3.dylib” is in use.",have closed everything even shut down,restarted computer several times. I just also updated my plug-ins.

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