Select like a boss, WebExtension ver. & Enhanced ver.

Edit:

Bug?: When enabling this extension, drag and drop function is triggered by it, then couldn't drop the link in the library listbox of firefox (non-textbox area), but work fine for dropping to external programs.

Edit 2:
Not a bug, it's my misunderstanding. By default press and hold on will select all of link text. To drag a link, I need to drag non-horizontally.