This reminds me of two other now-obsolete web debugging tools.
Weinre[1] let you to view the DOM, network requests, and console output when testing sites on a phone. Aardwolf[2] provided an interactive JavaScript debugger, by rewriting the code to add debug hooks.
[1] http://people.apache.org/~pmuellr/weinre/docs/latest/ [2] https://github.com/lexandera/Aardwolf