This is a draggable sidebar that you find in apps like Facebook and Spotify. I've tested it on my iPhone 5 and it works very smoothly.
Just copy all of the objects in the frame, and the one event in the event editor (due to the use of qualifiers), and then read the instructions in the Widget's behaviours, and you should be good to go.
Download here (works on Windows, iOS, Android, Flash and HTML5 runtimes)
If you use it it'd be nice to be credited, but you don't have to.
Feedback is always welcome
This isn't an extension, I know, but I think it'd be more useful here as I think more people would find it here.