I rebuilt my debug eng B2G flame image (from master) and I get the following spewed continuously in my logcat: > [Parent 298] ###!!! ASSERTION: Child frames aren't sorted correctly: 'nsIFrame::IsFrameListSorted<IsOrderLEQWithDOMFallback>(mFrames)', file ../../../b2g-inbound/layout/generic/nsFlexContainerFrame.cpp, line 1846 (even when the screen is off). When the screen is on, then I get: > [Child 958] WARNING: Transparent content with displayports can be expensive.: file ../../../b2g-inbound/layout/base/nsDisplayList.cpp, line 1311 > [Parent 298] ###!!! ASSERTION: Child frames aren't sorted correctly: 'nsIFrame::IsFrameListSorted<IsOrderLEQWithDOMFallback>(mFrames)', file ../../../b2g-inbound/layout/generic/nsFlexContainerFrame.cpp, line 1846 Child 958 in this case is the Homesceen.