Yes! I am using it as a replacement for QuickDrag on Firefox 57. I also thought that it did not work till I changed the minimum drag distance to 10 on the advice of Anonymous user 96ab79. I have google search links opened in background tabs at the last (right) position. It is a shame that escape does not cancel a drag as it did in quick drag. However, I don't think (or did not realise) that QuickDrag had an option to prevent the default behaviour of opening dragged links as links rather than text search. In this FireDrag you can "Ignore Selected Text if Dragging a Hyperlink" and turning this to off (the opposite of what I would have thought!) prevents links being opened ignoring the link, but simply searches Google for the text you are dragging. Great.