Earlier quoted context omitted.
And have it all reverted at random because well "there seems to be along time since you last used Firefox, do you want to lose all your configurations? Yes. Later."
Each time I see that prompt I have to pause and consider the otherwise wacky theory that there evil forces trying to cripple Mozilla from the inside. Why. Just why.
My bet is that they were receiving complaints of Firefox breaking due to bad migration of settings between versions, so instead of fixing the migrations, they decided that this user-hostile anti-feature was good enough.