This bug was filed from the Socorro interface and is report bp-456d3fe7-5ffe-4cee-914a-be8680181206. ============================================================= Top 10 frames of crashing thread: 0 xul.dll IPC::ParamTraits<nsIPrincipal>::Write dom/ipc/PermissionMessageUtils.cpp:23 1 xul.dll mozilla::ipc::IPDLParamTraits<mozilla::dom::WindowGlobalInit>::Write ipc/ipdl/DOMTypes.cpp:1905 2 xul.dll mozilla::dom::PBrowserChild::SendPWindowGlobalConstructor ipc/ipdl/PBrowserChild.cpp:337 3 xul.dll mozilla::dom::WindowGlobalChild::Create dom/ipc/WindowGlobalChild.cpp:60 4 xul.dll nsGlobalWindowInner::InnerSetNewDocument dom/base/nsGlobalWindowInner.cpp:1651 5 xul.dll nsGlobalWindowOuter::SetNewDocument dom/base/nsGlobalWindowOuter.cpp:1939 6 xul.dll nsresult nsDocumentViewer::InitInternal layout/base/nsDocumentViewer.cpp:969 7 xul.dll nsDocumentViewer::Init layout/base/nsDocumentViewer.cpp:715 8 xul.dll nsresult nsDocShell::Embed docshell/base/nsDocShell.cpp:6357 9 xul.dll nsDSURIContentListener::DoContent docshell/base/nsDSURIContentListener.cpp:182 ============================================================= There is 1 crash in nightly 65 with buildid 20181205213623. In analyzing the backtrace, the regression may have been introduced by patch [1] to fix bug 1487249. [1] https://hg.mozilla.org/mozilla-central/rev?node=20554da7b303