Isaac and I have been discussing this issue on Hangouts for the last couple of hours, I was actually having these same issues with the latest Firefox BETA on Android 7.1, and it looks like the issue is with some changed variable within the Chrome Beta and FireFox Mobile Beta.
What versions are you gents who're experiencing issues running? If you're experiencing an issue in a BETA/DEV build can you please install and try to recreate the issue with the latest non-beta/dev release? We need to try to nail down that it's only affecting beta/dev builds, so we have something to track down.