This is the most inspiring implementation of live web scraping that I have seen. However, I think it will only work well on semantic HTML. I don't know about AirBnb, used in the paper, but I can say many good words about GitHub. GitHub is an awesome example of a customizable web app thanks to solid, semantic HTML structure. You can see hundreds of web extensions and Tampermonkey user scripts for GitHub that work consistently. I wrote a few of my own.
As a co-founder of Handsontable, I am proud to see it used in this paper. Handsontable is a commercial spreadsheet component, however it is free for non-commercial purposes such as education, research, study, and personal use, testing and demonstration: https://github.com/handsontable/handsontable/blob/master/han...