Cannot install Extensions in Safari 9.0.1

I'm on Mac OS X on a MacBook Pro 2013 10.10.5 and I have noticed when I try to install all the extensions that are not the Safari Extensions Gallery, it opens with a window asking you if I trust in it and I click on trust, but the extension does not appear in the extensions list, or anywhere. This was happening on OS X 10.11.1 also. He was working on Safari 8, but not Safari 9.0.1. I have not found any discussion which has helped.

Please, back up all data before proceeding.

Launch the Keychain Access application in one of the following ways:

☞ Enter the first letters of his name in a Spotlight search. Select from the results (it should be at the top).

☞ In the Finder, select go utilities ▹ of menu bar or press the combination of keys shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

Use the search box in the toolbar of the Keychain Access window to find an item named 'Safari Extensions list'. If found, delete it. Quit Keychain Access.

Quit and restart the Safari app.

Tags: Mac OS & System Software

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