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.
Quit Safari.
Locate the plug-in. Plug-ins are usually installed in one of these folders:
/Library/Internet Plug-Ins/
(To find this folder, open the hard disk icon, and then open the Library folder.)
~/Library/Internet Plug-Ins/
(This folder is in your home folder (represented by the tilde ~). To find it, open the hard disk icon, open your home folder, and then open the Library folder.)
Remove any plug-ins you’ve added. You may need to enter the account name and password for an administrator account on your computer.
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 If the problem is fixed, contact the developer of the plug-in to report the problem and to see if there is a newer version of the plug-in.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.
Important:Removing a plug-in might prevent Safari from doing certain tasks, such as playing movies.