Hey. I'm on the development team at hash.ai. I'm going to be looking into this today, and will hopefully make some progress soon!
I'll certainly look into the plots issue. If you think of anything else worth mentioning about Firefox, it would be very helpful if you could email me at nh@hash.ai with details! If you feel comfortable providing it, a list of extensions you're using would go a long way to helping diagnose the issues you're encountering.