On Windows10, window control buttons(minimize, maximize, close) blink if Titlebar is disabled(default).
Bug 1818869 Comment 2 Edit History
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On Windows10, window control buttons(minimize, maximize, close) blink if Titlebar is disabled(default). Sometimes, tab title blink. Regression window: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=042779b7d50b41810724223ca2cf84fc473be387&tochange=b508157c9213b7237a7d600b8b98359fbd4067d5