Rated 5 out of 5 stars

Any chance of getting this to work properly with Tab Kit? At the moment tabs still go on the end. This is probably a job for the Tab Kit author though...

This review is for a previous version of the add-on (2.0.2.1). 

I assume that Tab Kit functions similarly to Tabs Open Relative, since it's by the same author. The "relative" tab feature is based on a list of sources hard-coded into the extension, so unless QuickDrag is on that list, tabs opened by QuickDrag will not be "relative".