If it ain't broke, don't fix it. I'm afraid the wisdom of history has been lost on this update of FF. It used to do all I needed with addins including the invaluable Down Them All to direct files to where they needed to go, now I'm forever cutting and pasting. I rolled back to pre 57 with a system restore, but it seemed to have become unstable, plus I couldn't put up with Firefox nagging every time I opened a new window. I'm seriously looking for options, this has been a bit of a productivity wet blanket. Maybe with time, Down Them All, Unplug, and others will return. Firefox 57 has been released prematurely in my view.