This bug was filed from the Socorro interface and is report bp-dec99f3f-f445-4d1d-8a9d-c745a0181123. ============================================================= Top 10 frames of crashing thread: 0 xul.dll mozilla::dom::XULTooltipElement::PostHandleEvent dom/xul/XULTooltipElement.cpp:93 1 xul.dll static void mozilla::EventTargetChainItem::HandleEventTargetChain dom/events/EventDispatcher.cpp:644 2 xul.dll static void mozilla::EventTargetChainItem::HandleEventTargetChain dom/events/EventDispatcher.cpp:721 3 xul.dll mozilla::EventDispatcher::Dispatch dom/events/EventDispatcher.cpp:1156 4 xul.dll void nsXULPopupManager::FirePopupShowingEvent layout/xul/nsXULPopupManager.cpp:1458 5 xul.dll void nsXULPopupManager::ShowTooltipAtScreen layout/xul/nsXULPopupManager.cpp:847 6 xul.dll void nsXULTooltipListener::LaunchTooltip layout/xul/nsXULTooltipListener.cpp:532 7 xul.dll nsresult nsXULTooltipListener::ShowTooltip layout/xul/nsXULTooltipListener.cpp:426 8 xul.dll static void nsXULTooltipListener::sTooltipCallback layout/xul/nsXULTooltipListener.cpp:742 9 xul.dll nsTimerImpl::Fire xpcom/threads/nsTimerImpl.cpp:684 ============================================================= this crash signature is newly showing up in firefox 64, perhaps related to the work in bug 1461798?

Handle the case when there is no tooltip text provider.

I'm not sure I understand how the tooltip provider can be null, but maybe this is during shutdown?

Pushed by bdahl@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/1bbf691c2a7e Fix crash when showing tooltip. r=NeilDeakin

Please nominate this for Beta approval when you get a chance.

Comment on attachment 9027994 [details] Bug 1509576 - Fix crash when showing tooltip. r=NeilDeakin [Beta/Release Uplift Approval Request] Feature/Bug causing the regression: Bug 1461798 User impact if declined: Firefox can crash under unknown circumstances. Is this code covered by automated tests?: No Has the fix been verified in Nightly?: No Needs manual test from QE?: No If yes, steps to reproduce: List of other uplifts needed: None Risk to taking this patch: Low Why is the change risky/not risky? (and alternatives if risky): Simple null ptr check added. String changes made/needed:

Comment on attachment 9027994 [details] Bug 1509576 - Fix crash when showing tooltip. r=NeilDeakin Crash fix, let's uplift for the 64 RC.