Nice! We built something like this 3 years ago while I was still at Intoli. Instead of Puppeteer we used our own Web Extensions API based framework called Remote Browser [1], the core of which was written by my cofounder.
The tour is still up at [2]. The servers that actually run the Remote Browser have since gone down, but interestingly you can still run the tour. That's because if you don't change the code in the REPL window, you get cached results (except step 7/7 which scrapes Hacker News and won't work). To get those results, we built a little tour "recorder" that would be run on every release. If I remember correctly, we allowed some dynamic ES6 imports through a custom Babel compiler for the code that's input, which also allows first level async stuff, which still works :)
The tour is still up at [2]. The servers that actually run the Remote Browser have since gone down, but interestingly you can still run the tour. That's because if you don't change the code in the REPL window, you get cached results (except step 7/7 which scrapes Hacker News and won't work). To get those results, we built a little tour "recorder" that would be run on every release. If I remember correctly, we allowed some dynamic ES6 imports through a custom Babel compiler for the code that's input, which also allows first level async stuff, which still works :)
[1]: https://github.com/intoli/remote-browser [2]: https://intoli.com/tour/