This bug was filed from the Socorro interface and is report bp-3568e654-c15d-4795-8842-492be0180427. ============================================================= Top 10 frames of crashing thread: 0 XUL nsStubMutationObserver::AttributeWillChange dom/base/nsStubMutationObserver.cpp:17 1 XUL nsNodeUtils::AttributeWillChange dom/base/nsNodeUtils.cpp:157 2 XUL mozilla::dom::Element::SetAttr dom/base/Element.cpp:2517 3 XUL nsScrollbarFrame::UpdateChildrenAttributeValue dom/base/Element.h:839 4 XUL nsScrollbarFrame::AttributeChanged layout/xul/nsScrollbarFrame.cpp:99 5 XUL mozilla::RestyleManager::AttributeChanged layout/base/RestyleManager.cpp:3324 6 XUL mozilla::PresShell::AttributeChanged layout/base/PresShell.cpp:4458 7 XUL nsNodeUtils::AttributeChanged dom/base/nsNodeUtils.cpp:170 8 XUL mozilla::dom::Element::SetAttrAndNotify dom/base/Element.cpp:2711 9 XUL mozilla::dom::Element::SetAttr dom/base/Element.cpp:2537 ============================================================= There is 1 crash in nightly 61 with buildid 20180426220144. In analyzing the backtrace, the regression may have been introduced by patch [1] to fix bug 1431246. [1] https://hg.mozilla.org/mozilla-central/rev?node=d3b5dfca6a90

Without an STR this is not really actionable. I would like to wait and see if this shows up more and hopefully find a test case to make this actionable.

There hasn't been another report since this was filed. Resolving as WFM.