Crash reports with about:memory data have the annotation ContainsMemoryReport=1. We'll need a way to search for such reports.
Do you have a crash that contains this in its raw crash?
According to bug 1026059 comment #12 this is a reports that should have one: bp-a3b212d7-505f-44c7-8f62-0d41b2140831
This WFM now. I was able to do a super search for reports with this field.