I updated to Yosemite and cannot turn on extensions in Safari

I updated to Yosemite 10.10 on my MacBook Pro and now cannot turn on extensions in Safari (8.0), Preferences, Extensions. When I move the slide button to the "on" position it immediately moves to the "off" position. I turned off all extensions and restarted Safari and it did not help. Thank you for the help.

Howdy peze,
Welcome to Apple Support Communities.
It sounds like there’s an issue with keyboard shortcuts in one specific app, Safari, since upgrading to OS X Yosemite. Take a look at the article linked below which describes a similar issue and walks you through the process of identifying conflicting keyboard shortcuts.
OS X Yosemite: If a keyboard shortcut doesn’t work
Ciao,
-Jason

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