New approach reuses PROMPT_ACTION instead of defining a new ALWAYS_ASK_ACTION value, to avoid poisoning profiles (old Firefoxes would crash on downgrade from not recognizing the new value).
Bug 1609427 Comment 31 Edit History
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New approach reuses PROMPT_ACTION instead of defining a new ALWAYS_ASK_ACTION value, to avoid poisoning profiles (old Firefoxes would crash from not recognizing the new value).