We've decided to update XKit. It's harder than it looks. We're not in contact with the original XKit Guy, nor do we have access to xkit.info. We currently operate at this blog and on GitHub.
I forgot to mention in my submission about the missing icon that I am using the latest firefox 39.
That’s very strange. Can you type “about:config” into your address bar (click through the scary notification), search for “xkit7.xkit”, and send us a screenshot of the results?