Ancestry.com has just added a new record set Ireland, Abstracts of Wills and Marriages 1620-1923. It explains Original data: Crossle, Betham and Thrift Genealogical Abstracts. Dublin, Ireland: Microfilm of original records at the National Archives.
Some of these are on-line at the National Library of Ireland (not the National Archives); more are available on microfilm at FamilySearch and the same records have for some years been available on FindmyPast. Their addition to Ancestry, if they are reasonably complete and well-indexed, will be a help to those with an Ancestry subscription but not one to FindmyPast.
These abstracts are explained in Irish Quaker Sources and Resources, section on Wills and Probate.