Safari: Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues


Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues.

Unsupported third-party add-ons may add features to Safari or change its appearance. If you use unsupported third-party add-ons you may encounter issues such as these:

  • Safari quits unexpectedly
  • Safari runs slowly
  • Safari is unable to download files
  • Other unexpected behavior

Note: This article does not apply to Internet Plug-Ins such as QuickTime, Java, and Adobe Flash. It also does not apply to Safari Extensions.


Use the add-on's uninstaller, if possible

  1. Quit Safari.
  2. Remove any unsupported third-party add-ons you've installed (see if the add-on's installer includes an uninstall feature).
  3. Open Safari again.

If these steps fix the issue you were having, check the website of the software's developer to see if there is an updated version available, or avoid using the add-on.

Manually uninstall third-party add-ons

If the software doesn't have an uninstall feature, quit Safari and try manually moving the third-party add-on files. These files are usually installed in one or more of the following locations:

  • /Library/Internet Plug-Ins/
  • /Library/Input Methods/
  • /Library/InputManagers/
  • /Library/ScriptingAdditions
  • ~/Library/Internet Plug-Ins/
  • ~/Library/Input Methods/
  • ~/Library/InputManagers/
  • ~/Library/ScriptingAdditions

The first four locations listed are in the root-level Library on your hard disk, not the user-level Library in your Home folder.

The tilde (~) represents your Home folder.

  • To access the Home folder in OS X Lion, OS X Mountain Lion, or OS X Mavericks, open the Finder, hold the Option key, and choose Go > Library.
  • To access the Home folder in Mac OS X v10.6 and earlier, open the Finder and choose Go > Home. Then, click the Library folder.

If the issue is resolved by removing items from the above locations to a different location, return the items one at a time and test Safari. That way you can determine which item is causing the issue. Once identified, remove the problematic item and put the others back. Check for updates to the items that are found to cause issues, or report the issue to the add-on developer.

Important: When removing items from the above locations, do not put them in the Trash. Instead, put them in a new folder or on the desktop while troubleshooting. If removing the item does not resolve the issue, you can put it back where it came from. In Mac OS X v10.6 or later, you can use the Put Back feature of the Trash to automatically put items back where they came from.

Files that should not be removed

The following items should not be deleted from your system:

  • /Library/Internet Plug-Ins/Default Browser.plugin
  • /Library/Internet Plug-Ins/iPhotoPhotocast.plugin
  • /Library/Internet Plug-Ins/nsIQTScriptablePlugin.xpt
  • /Library/Internet Plug-Ins/Quartz Composer.webplugin
  • /Library/Internet Plug-Ins/QuickTime Plugin.plugin
  • /Library/Internet Plug-Ins/QuickTime Plugin.webplugin (Mac OS X v10.5.x only)
  • /Library/Internet Plug-Ins/VerifiedDownloadPlugin.plugin (Mac OS X v10.5.x only)

Reinstalling the above plug-ins requires reinstalling OS X. Some application or system updates may restore specific plug-ins.

Temporarily removing the plug-ins listed above for testing is OK, however if doing so does not resolve the issue, the files should be put back. If an issue is found with any of these plug-ins, do not permanently remove the item from the system--leave it in the temporary location and contact AppleCare support to report the issue.

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.
Last Modified: Jan 14, 2014
  • Last Modified: Jan 14, 2014
  • Article: TS3230
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