Unfortunately I don't know of a way. Is there perhaps some pref that controls behavior around this and we have it different? The assertion in comment 20 probably explains the issue bug no idea how Thunderbird gets here and not Firefox.
Bug 1959171 Comment 37 Edit History
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Unfortunately I don't know of a way. Is there perhaps some pref that controls behavior around this and we have it different? The assertion in comment 20 probably explains the issue but no idea how Thunderbird gets here and not Firefox.