We need to do a null check in FocusTarget for the retargeted PresShell. This logic didn't make it over from PresShell's event handling in the original patch.
Created attachment 8881895 [details] [diff] [review] focus-target-null.patch
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/5283088aa3be Check if we have a retargeted PresShell in FocusTarget. r=kats