I've confirmed with moz-regression that that bug is indeed the regressor: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=7a6a822be3b4508223a476ea1ab3940a4541db1c&tochange=f8faae6114e00d12dcfbb3ed07b6fbd89c400944
Bug 1645008 Comment 25 Edit History
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I've confirmed with moz-regression that that bug is indeed the regressor: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=7a6a822be3b4508223a476ea1ab3940a4541db1c&tochange=f8faae6114e00d12dcfbb3ed07b6fbd89c400944 I'm on Windows 10, 1 monitor, 1920x1080, DPI 150%, Nightly is maximized.