Created attachment 652204 [details] Backtrace. Backtrace attached. The problem appears to be that nsObjectFrame::BeginSwapDocShells() queries objectFrame->PresContext()->GetRootPresContext(), and that value is NULL. IonMonkey doesn't appear on the stack. Not sure whether we're causing the crash, but it doesn't happen on Nightly. No particular steps to reproduce -- it crashes randomly when the browser is open for a long time. Visiting a page with embedded Flash may expedite the process.
What changeset is your build from?
Assignee: general → nobody
No longer blocks: 745386
Status: NEW → RESOLVED
Last Resolved: 6 years ago
Resolution: --- → DUPLICATE
Summary: IonMonkey: Frequent crash while browsing: nsRootPresContext* in DOM is NULL → Frequent crash while browsing: nsRootPresContext* in DOM is NULL
Duplicate of bug: 781272
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