i just want to mention something about the "Sorry, MagicScroll was unable to parse this page" window.
because "Report This Page" is the only button, i instinctively hit it under the muscle-memory assumption that it's the back/escape button. chances are you're going to get a good deal of noise from beginners because of this
The code is open source and available at https://github.com/rdwallis/MagicScrollWebReader if you want to have a poke at it.