Works well, but there's a problem with the Twitch.tv website where after selecting to clip any stream, you get greeted with this error message on the next screen: "This video is either unavailable or not supported in this browser. (Error #4000)".

Turning off this add-on fixed the issue. But maybe if there was an option to disable the add-on on certain domains it'd be better than having to turn the add-on on and off depending on what website I'm at.