Bug 1747291 Comment 0 Edit History
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The titlebar is hidden by default on Windows and macOS, we should do the same on Linux since now we have a very good styling and proper window decoration with the tabs in titlebar. https://searchfox.org/comm-central/rev/0368d67d00ca8d6bbd4ac146a32bbfa0ce422198/mozilla/modules/libpref/init/StaticPrefList.yaml#1350