I have a patch to add some null checks to nsRegionXlib.cpp. I doubt it will make much difference, but it seems like a good idea, and the GTK+ port has them.
updating component, assigning to xlib tracker, adding gisburn, assigning to bug owner...
Created attachment 41472 [details] [diff] [review] Patch to add null checks, this time with "diff -u"
Patch looks good r=pocemit
Patch checked in. Thanks!