I don't see any documentation at all, like what browsers are supported, etc. :/
I just tried it out and it seems to be tied to Chrome. Since I use Firefox and Chromium as my daily drivers this does not work for my case. I understand that they probably rely on some Chrome internals to dig through the content, a SOCKS Proxy approach would have worked better and would have no need to switch between a "save" and "serve" mode. But then again I was only scraping the top of it because of the lack of browser support. Will keep an eye on this one though!
One .py file. Only one dependency (urllib3).n with a little love the concept could become a full transparent proxy.