The service itself is good but the addon still needs some work. I can't access the settings or history without creating a short url, and (as far as I can tell) it is not possible to set a custom url through the extension, only on the main website.
I think the popup should have the option of setting a custom url and a button to shorten the current page instead of doing it automatically, like the YOURLS addon - but not as ugly. (https://i.imgur.com/c1GLl9K.png). The link to the dashboard and the ability to right click on a link and shorten it are awesome features of the YOURLS addon that I'd love to see implemented for Kutt too. :)

Best URL shorten-er out there!

Simply beautiful. Shortening URLs has never been so quick.