"No route definitions found" on mobile Firefox
In Firefox for Android 67.0, all Coauthor pages show "iron:router No route definitions found" instead of Coauthor content. If I "Request desktop site" from Firefox's menu, Coauthor functions normally (but isn't sized for mobile). I think this option changes the user agent, but I'm not sure.
I couldn't reproduce the problem on desktop Firefox with the devtools' simulation of being mobile.
I can reproduce this on desktop Chrome using User Agent Switcher, and choosing Android Kitkat. It seems to be an issue with Babel: in the console, I see Uncaught ReferenceError: regeneratorRuntime is not defined in some Babel-translated code. I'll try updating Meteor and Babel, which will hopefully fix the problem.
Reported upstream: https://github.com/meteor/meteor/issues/10606