Yup, Frost was just a wrapper for the mobile site, but it had notifications, dark theme and other trimmings and barely used battery vs. the official app. I've been keeping an eye on the official FB app's battery usage on the new phone and so far in the space of 40% used since I charged my phone to 80% in the morning (with it being 8pm now), there has been no battery consumption from FB at all. This is much better than it used to be. I'm sure when I actively use it it will drain more, but I don't use it really, only if someone sends me a link or if I need to check birthdays.
It's the background usage before that was killing me.
I stopped using Facebook on my phone because of the drain it had on battery. I have a new phone which manages it better and it's back on my phone again, but, like, who even uses FB these days ahead of other apps? Anyway, I still use it for birthdays (which is why I had Frost installed before Facebook broke it), but I miss the days you could just add Facebook birthdays to Google Calendar. Facebook killed that too.
There's cableporn and I'm okay with it