Once again, if you are using Safari 6.1.1 or 7.0.1, due to changes Apple made, you need to update to XKit 7.3.2 available here.

Just re-download XKit from the link above and restart your browser. Your preferences will be preserved. Please send me an ask only after if you’ve updated to 7.3.2 and the XKit is still not showing up. Thank you!