I'm currently working on implementing the solution proposed in comment 19. I think I'll have a rough patch up in the next few days.
Bug 1578070 Comment 21 Edit History
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I'm currently working on implementing the solution proposed in comment 19 (some more context: https://mozilla.logbot.info/domfission/20191211#c16811715). I think I'll have a rough patch up in the next few days.