Howdy - one of the authors here. I believe to my knowledge the only thing that requires bootstrap.js is the popover stuff, which we plan to decouple anyway.

Make an issue on github and we'll get to it soon: https://github.com/mozilla/metrics-graphics/issues

Awesome, thanks! I will do so :) (I'm currently in the process of ripping Bootstrap out of an app for performance reasons and styling flexibility -- flexbox)