75 summer, 71 winter. Would love to conserve more but my body is a picky jerk.
It works until Firefox applies updates and the next time you open it it automatically loads a "what's new in Firefox" tab erasing your previous session. Then you're SOL unless there's some way around that.
I tried it on the browser on my own and it seemed to work okay at first glance. I haven't tried the app due to the 3.8-star rating on Google Play that is actually closer to a 3-star rating when you account for the fact that half of the 5-star ratings look fake. Main complaints seemed to be sound and video quality and getting disconnected. The fact that anybody can just come into your session if they guess the room name correctly isn't optimal either. Overall it feels janky, or maybe I am spoiled. I could be spoiled.