Yep, regardless of whose "fault" it is — and I totally buy that it's macOS's fault, considering how much effort my startup Cyph has to spend on working around Safari/iOS bugs — at the end of the day Firefox is unusable for me if my battery won't last for any reasonable amount of time and I have to deal with a kernel panic every other day.

Really hoping this gets sorted out soon, because on most other counts I prefer the current Firefox to Chrome. (The other thing keeping me on Chrome is pinch-to-zoom support.)