Bug 1420547 intentionally made the PresShell notification occur earlier than mutation observer notification. But reversing the order [doesn't break anything](https://treeherder.mozilla.org/jobs?repo=try&revision=011ccc4d9c4add7ce9e8b3810e7bea4df1cbb4a8&selectedTaskRun=QRdxl7nIQKuJjVtKZZAM_w.0). Does the previous assumption still apply?
Bug 1601416 Comment 4 Edit History
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Bug 1420547 intentionally made the PresShell notification occur earlier than mutation observer notification. But reversing the order [doesn't break anything](https://treeherder.mozilla.org/jobs?repo=try&revision=011ccc4d9c4add7ce9e8b3810e7bea4df1cbb4a8). Does the previous assumption still apply?