How to disable a plug-in in Apple Safari version 5
Safari does not allow you to disable plug-ins individually (except Java). You may disable all plug-ins or uninstall them separately, but they will be deleted from all browsers. As far as the plug-in is insecure, its use may be harmful for any browser, therefore you should delete it without any doubt you can reinstall it as soon as a patch is issued.
Java plug-in is an exeption: you can disable it separately.
To view all installed plug-ins, press Alt (the menu opens), choose Help Installed Plug-ins.
To disable all plug-ins or Java:
Click in the upper right corner of your browser, choose Preferences in the menu.
Click Security icon.
Uncheck Enable plug-ins in the Web content panel to disable all plug-ins except Java.
Uncheck Enable Java to disable Java.