There is a chrome extension available in their app store (or whatever it is called). Jeff Snavely wrote it up a while ago -- it has gone through many versions and updates. Unfortunately every time Ancestry tinkers with their website it can break the app. That being said, it does a decent job of scanning your tests, and then creating a csv export file of your matches and also a csv export file with all the ancestors of your matches (if they have public trees).
Elizabeth
Fredericksburg, VA