Small popup on Windows and Mac still uses BasicLayerManager. When ShouldUseOffMainThreadCompositing() returns false, BasicLayerManager is created for rendering. https://searchfox.org/mozilla-central/rev/a14ecd829fdb1e9780b7c100016c6a3d951cf7da/widget/cocoa/nsChildView.mm#1221 https://searchfox.org/mozilla-central/rev/a14ecd829fdb1e9780b7c100016c6a3d951cf7da/widget/windows/nsWindow.cpp#7543 https://searchfox.org/mozilla-central/rev/a14ecd829fdb1e9780b7c100016c6a3d951cf7da/widget/windows/nsWindow.cpp#4098
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Small popup on Windows and Mac still uses BasicLayerManager. BasicLayerManager is going to be removed on 93. When ShouldUseOffMainThreadCompositing() returns false, BasicLayerManager is created for rendering. https://searchfox.org/mozilla-central/rev/a14ecd829fdb1e9780b7c100016c6a3d951cf7da/widget/cocoa/nsChildView.mm#1221 https://searchfox.org/mozilla-central/rev/a14ecd829fdb1e9780b7c100016c6a3d951cf7da/widget/windows/nsWindow.cpp#7543 https://searchfox.org/mozilla-central/rev/a14ecd829fdb1e9780b7c100016c6a3d951cf7da/widget/windows/nsWindow.cpp#4098