Comment #0 indicates the original reporter used macOS, but bug 1588975 affected Windows only.
Bug 1620094 Comment 11 Edit History
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Comment #0 indicates the original reporter used macOS, but bug 1588975 affected Windows only. I could also reproduce the situation described in comment #6. This happens before `ShellExecute` or `ShellExecuteByExplorer` is called, so this is not a regression from bug 1588975.