suggested as a replacement for QuickDrag (which was killed by Quantum), and does a decent job at that. i originally thought it didn't work, but you need to change the dragging distance to like "10" to make it behave like QuickDrag. there are other controls as well to tweak to be more like QuickDrag which are nice. i am happy with FireDrag now, thanks!

EDIT: dropped a star or two because it breaks Facebook. with this add-on enabled facebook threads suddenly close and you can't open the messenger at all. it's been many months now without a fix, so hopefully one day the two will get along. until then i keep using quickdrag because it's SO useful, especially compared to facebook which is pointless and mostly dumb.