I recently upgraded to High Sierra and I liked the upgrade too but the most annoying thing is that the safari extensions which I download from the official Apple website keep on getting deleted by itself I have tried to fix the problem by trying the following stuff:

Deleting ~/Library/Safari/Extensions/Extensions.plist
Deleting ~/Library/Safari/Extensions/

So can someone help me around with this problem?

1 Answer 1


Most likely: Another case of self-corrupting but never correcting caches.

  • Close Safari.

  • Remove ~/Library/Caches/com.apple.Safari (the entire folder and its contents, where mismatching copies of the extension pile up with a pattern of name-1.safariextension, name-2.safariextension .)

  • Restart Safari.

  • Download the extensions you need once more.

  • Extensions should stay put again.

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