Android 6.0.1
Firefox 60.0.1
Fixed. You can testing on this site for newest version.
Great, it's working now on the Firefox for mobile browser!
But now there's a problem with the reposition on the Firefox for PC browser. The reposition image is no longer smooth like before. It is very slow and clunky. The image moves a very short distance and then the browser auto grabs the image to drag and drop it to another location.
Linux 17.10
Firefox Quantum 60.0.2 (64 bit)