This is an awesome method. But it's not where I need it - if you have the site in your browser, you can already do most interesting things with DOM scraping or MITM (as mentioned in the article).

Now, if we had a tool to extract the DOM from a mobile device and/or from apps that use pinning, that would be MUCH more interesting.

PS yes, I know frida, but last time I looked it's basically a platform that you'd need to build all the machinery on top of.