I'm a developer, but it is more of a user-centric question.

How can one "unregister" a Finder Sync (or any other, presumably) OS X / macOS App Extension so that it disappears from System Preferences > Extensions?

I've removed the app that's hosting it (FinderSyncTest), but it still shows here:

How to remove 10.10 Application Extension


I found my extensions in:


Delete FinderSyncTest.appex, restart Finder, and it should be gone.

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  • Unfortunately, this is not the case here. – qdot Oct 24 '14 at 11:21
  • Try running "locate FinderSyncTest" from Terminal. Good chance you'll find where the extensions are located. – dejuknow Oct 24 '14 at 22:35
  • It didn't work for me for my project..... Any other way to find? – Anoop Vaidya Jul 27 '16 at 11:59

Another answer in addition to my previous one: if your extension is actually runnable (i.e.: it doesn't crash when started via System Preferences -> Extensions), find the extension in your Activity Monitor, double click the process, then go to the "Open Files and Ports" tab. You'll see the path of your extension listed.

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Did you create this extension yourself?

I found that after creating, building, and testing an extension I created that there was some data that lives here:


that I needed to blow away to get the extension to "die"

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  • 1
    Yes I created my own, but it does't exist there, I removed all the files in DerivedData, but still see whole bunch of extensions. – Anoop Vaidya Jul 27 '16 at 12:00

I found my location via the "Open Files and Ports" location in Activity Monitor mentioned in the other answer.

This lead to the location:

/Users/USER/Library/Developer/Xcode/Archives/2018-10-09/MyApp 10-9-18, 9.35 PM.xcarchive/Products/Applications/MyApp.app/Contents/PlugIns/MyAppFinderSync.appex/Contents/MacOS/MyAppFinderSync

This archive was 10 days old and I'm not sure why it would have been running. I've been deleting my app since that date, and I believe the extension was being removed from System Preferences.

I deleted the archives in that location, and the app extension no longer runs (which it was doing before). However, it's still listed in System Preferences. Still looking for a way to fully delete.

Edit: I started running a new version of the container app, from /Applications/. About 10 minutes later, I went back to System Preferences and toggled the Extension on/off and back to on. This launched the new version of the Extension and everything appears to now be working normally.

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