If you need to remove a plug-in
If you have recently installed a plug-in and notice that Safari runs more slowly, quits unexpectedly, won’t download files, or exhibits other performance problems, the new plug-in may be the problem.
To remove a plug-in:
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Quit Safari.
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Locate the plug-in on your computer.
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Remove any plug-ins you’ve added.
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Important:Removing a plug-in might prevent Safari from doing certain tasks, such as playing movies.
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Reopen Safari. If the problem is fixed, contact the developer of the plug-in to report the problem and to see if there is a newer version of the plug-in.
Removing plug-ins may affect other applications on your computer that use plug-ins.