This bug was filed from the Socorro interface and is report bp-6633c438-2603-43f1-b7b7-0a3e90180822. ============================================================= Top 10 frames of crashing thread: 0 libxul.so gfxFontMissingGlyphs::Shutdown mfbt/LinkedList.h:325 1 libxul.so gfxPlatform::OnMemoryPressure gfx/thebes/gfxPlatform.cpp:474 2 libxul.so mozilla::layers::MemoryPressureObserver::Observe gfx/layers/MemoryPressureObserver.cpp:67 3 libxul.so nsObserverService::NotifyObservers xpcom/ds/nsObserverList.cpp:112 4 libxul.so MinimizeMemoryUsageRunnable::Run xpcom/base/nsMemoryReporterManager.cpp:2773 5 libxul.so nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:1167 6 libxul.so NS_ProcessNextEvent xpcom/threads/nsThreadUtils.cpp:519 7 libxul.so mozilla::ipc::MessagePump::Run ipc/glue/MessagePump.cpp:97 8 libxul.so MessageLoop::Run ipc/chromium/src/base/message_loop.cc:325 9 libxul.so nsBaseAppShell::Run widget/nsBaseAppShell.cpp:158 ============================================================= There is 1 crash in nightly 63 with buildid 20180821220101. In analyzing the backtrace, the regression may have been introduced by patch [1] to fix bug 1479196. [1] https://hg.mozilla.org/mozilla-central/rev?node=07dabfefeef1

Fixed in bug 1485358.