FireDrag 2.0.0 (Oct 27, 2017) is not ready for prime time.

Showstopper: It simply fails to work at all on some pages.

Major shortcoming: Limited to pre-defined search engines

Annoyance: Settings dropdown for "New Tab Position" is non-functional.

Using Firefox 56.0.2 64-bit on Windows.

The search continues for a decent drag extension compatible w/FFox 57.