Extensions in SAFARI

What is the msg in the preferences of Safari extensions, after installation?

Mine has changed dramatically and I was wondering...

10 Safari macOS Sierra 10.12

When an extension is installed, this is what looks like the extension of the Safari preferences pane.

Check the box next to the extension name to allow.

Activate the extension and click on the "Uninstall" button to uninstall it.

Tags: Mac OS & System Software

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