On the whole, we have better information in previous threads here than Fuld provides on the tune, and see The Fiddler's Companion for more.

Information now available shows that the tune was known in both England and America by the mid-to-late 1760s, though it may not be much older than that. By the 1790s, everybody seems to have known it. There is no apparent reason, historical or stylistic, to connect it with Ireland (if not English, an American origin would be the next most likely), and Fuld's comment is puzzling on that score.

A good ABC resource is Steve Mansfield's How to interpret abc music notation